The statement is true because not all adverbs can have degrees of comparison. Only adverbs of time, manner and degree such as early, swiftly, quickly etc can have degrees of comparison. Adverbs such as now, where and then do not have degrees of comparison.

Option A is the correct answer because the positive degree of comparison is used when no comparison is being made in a sentence. 
For example: He ran fast. (no comparison)
Option B and C are wrong because the comparative and superlativr degrees are used when two and more than two things respectively are being compared.
Option D is wrong because it is not a degree of comparison.

Option D is the correct answer because the superlative degree is formed by adding "est" to the adverb "early."
Options A, B and C are incorrect because they are not the correct superlative degrees.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example, "I ran fast". Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, "She ran too fast". Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example, "I ran fast". Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, "She ran too fast". Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example, "I ran fast". Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, "She ran too fast". Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example, ''I ran fast''. Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, ''She ran too fast''. Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example,'' I ran fast''. Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, ''She ran too fast''. Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

In order to fill in the blank with the suitable degree of the adverb, let's understand what adverbs are. Adverbs are words that describe something about the verbs. For example, ''I ran fast''. Here, 'fast' describes the way 'I' ran, so 'fast' is an adverb. Degrees of the adverbs explain us the intensity of an action, adjective or another adverb. For example, ''She ran too fast''. Here, 'fast' is the adverb and 'too' intensifies how fast she ran.

An adverb is a word that modifies a verb, adjective or another adverb.
The given sentence is in the superlative degree because it compares one person "Arum" with a group of people "of all".
Option B: 'Hardest' is an adverb of the superlative degree, hence it's the most suitable option.
Options A and C: Hard and harder are in the positive and comparative degree, respectively. But the given sentence is in the superlative, hence A and C are incorrect.
Option D: 'Most hard' is incorrect in itself. 'Most' is generally added to adverbs that end in -ly. So, it isn't added to words like 'hard'.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Slowly' is an adverb of positive degree. 'Well' is an adverb of manner/degree. 'Very fast' is an adverb of manner. 'Better' is a comparative degree of an adverb. Thus, option A is the correct answer.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Slowly' is an adverb of positive degree. 'More slowly' is a comparative form of degree. Options B and C are not using any comparative form of degree.

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Happily' is an adverb of positive degree. 'More happily' is an adverb of comparative degree. 'Most happily' is an adverb of superlative degree. 'Happy' is an adverb of manner. 

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Most' is the word used which denotes the superlative degree of an adverb.

In the given sentence, two people are compared in the terms of their speeds of eating. Thus, the answer must be an adverb of manner in its comparative degree.

• From the given options, we can eliminate the options A and B which do not fit into the sentence. Both options A and B are personal pronouns which are unsuitable in this scenario. Option C is an adverb, which cannot be placed after the adjective such. Here, Option D, that, is the most appropriate because it acts as a connective, referring to the previously mentioned noun treatment, giving further information to the clause.
  

An adverb is a word or phrase that qualifies or changes an adjective, verb or another adverb, to express a relation of a situation, cause etc.

The given sentence is an example of adverb of positive degree. An adverb that does not make a comparison is said to be in the positive degree of an adverb. 'Much' is an adverb of positive degree. 'More' is an adverb of comparative degree. 'Most' is an adverb of superlative degree. 'Many' is the adverb of degree.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Good' is an adverb of positive degree. 'Better' is an adverb of comparative degree. 'Best' is an adverb of superlative degree. 'Well' is an adverb of degree.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Long' is an adverb of positive degree. 'Longer' is an adverb of comparative degree. 'Longest' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of adverb of positive degree. An adverb that does not make a comparison is said to be in the positive degree of an adverb. 'Little' is an adverb of positive degree which is used with an uncountable noun. 'Water' is an uncountable noun here. 'Less' is a comparative form of degree which is used as an adverb before an adjective or another adverb. 'Few' is used with plural countable nouns. 'Least' is the superlative form of 'little' and used as an adverb after 'the' and before an adjective.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Skilfully' is an adverb of positive degree. 'More skilfully' is a comparative form of degree. 'Most skilfully' is the superlative form of an adverb. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of adverb of positive degree. An adverb that does not make a comparison is said to be in the positive degree of an adverb. 'Far' is an adverb of positive degree. 'Farther' is a comparative form of degree. 'Farthest' is the superlative form of an adverb.'Further' is also a comparative of 'far'.

The given sentence is an example of adverb of positive degree. An adverb that does not make a comparison is said to be in the positive degree of an adverb. 'Much' is an adverb of positive degree. 'More' is an adverb of comparative degree. 'Most' is an adverb of superlative degree. 

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Far' is an adverb of positive degree. 'Farther' is an adverb of comparative degree. 'Farthest' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Near' is an adverb of positive degree. 'Nearer' is an adverb of comparative degree. 'Nearest' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Late' is an adverb of positive degree. 'Later' is an adverb of comparative degree. 'Latest' is an adverb of superlative degree. 'Last' is an adverb of time.

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Good' is an adverb of positive degree. 'Better' is an adverb of comparative degree. 'Best' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Bad' is an adverb of positive degree. 'Worse' is an adverb of comparative degree. 'Worst' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Much' is an adverb of positive degree. 'More' is an adverb of comparative degree. 'Most' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Early' is an adverb of positive degree. 'Earlier' is an adverb of comparative degree. 'Earliest' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The given sentence is an example of the adverb of superlative degree. Superlative form of an adverb is used to show something has performed an action to the greatest or least degree. 'Far' is an adverb of positive degree. 'Farther' is an adverb of comparative degree. 'Farthest' is an adverb of superlative degree. 'As' is used as an adverb for referring to what someone or something does or how they appear. 

The correct answer is option A.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option C is correct as more happily is the comparative form of happily. Consequently, the other options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.
Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
So, in this case, obviously Option C is correct as the comparative form of the adverb has been used.
Option A is incorrect because the adverb hasn't undergone any change in the degree of comparison.
Option B is incorrect because 'fastly' is an incorrect word.
Option D is incorrect because fastest is the superlative form.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here,
Option B is correct as most politely is the superlative form of politely. Consequently the other three options cancel out.

Adverbs ending in ly form the comparative by adding more and the superlative by adding most.

Option A is incorrect as more skilfully is the comparative form of skilfully.
Option B is incorrect as skilfully is the positive form.
Option C is incorrect because there is no such word as skilfullier.
Option D is correct as most skilfully is the superlative form of skilfully.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option B is correct as more clearly is the comparative form of clearly. Consequently, the other options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option B is correct as more is the comparative form of much. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option C is correct as worst is the superlative form of badly. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option C is correct as best is the superlative form of well. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option B is correct as better is the comparative form of well. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option C is correct as most gracefully is the superlative form of gracefully. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option B is correct as higher is the comparative form of high. Consequently, the other three options cancel out.

The given sentence is an example of the adverb of comparative degree. An adverb that compares two things becomes a comparative degree of an adverb. 'Diligently' is an adverb of positive degree. 'More diligently' is a comparative form of degree. 'Most diligently' is the superlative form of an adverb. 'Diligent' is an adjective.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option A is correct as slower is the comparative form of slow. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option B is correct as most is the superlative form of much. Consequently, the other three options cancel out.

Adverbs modify a verb, an adjective and sometimes another adverb in a sentence.

Some adverbs, like adjectives, have three degrees of comparison.
If the adverb is of one syllable, we form the comparative by adding er, and the superlative by adding est, to the positive; as, 'fast-faster-fastest'.
Adverbs ending in ly form the comparative by adding more and the superlative by adding most; as, 'swiftly-more swiftly-most swiftly'.

Here, Option A is correct as father is the comparative form of far. Consequently, the other three options cancel out.

The correct answer is Option B.