To answer this question, you need to understand the meaning of the word "elegy."

Option A) "hot temperature" - This option is incorrect because "elegy" does not refer to a hot temperature. It is actually a noun that describes a specific type of poem or song.

Option B) "funeral song" - This option is correct. An elegy is a mournful poem or song that is typically written to express sorrow or grief for someone who has died.

Option C) "valuable person" - This option is incorrect. "Elegy" does not refer to a valuable person. It is related to mourning and expressing grief, not to the value of a person.

Option D) "easy to fool" - This option is incorrect. "Elegy" has nothing to do with being easy to fool. It is specifically associated with expressing sorrow or mourning.

The correct answer is B) "funeral song" because an elegy is a mournful poem or song typically written to express sorrow or grief for someone who has died.

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To solve this question, we can use the concept of man-days of work.

Let's calculate the total man-days required to build the wall: 17 men working for 24 days = 17 * 24 = 408 man-days.

Now, let's calculate the work done by the 17 men in one day: Work done in one day = Total man-days / Total days = 408 / 24 = 17 man-days.

Next, let's calculate the work done by one man in one day: Work done by one man in one day = Work done in one day / Number of men = 17 / 17 = 1 man-day.

We are given that the hours per day are reduced in the ratio 5:4. This means that the work done by one man in one day is also reduced in the same ratio.

Let's calculate the work done by one man in one day after the reduction: Reduced work done by one man in one day = Work done by one man in one day * (4/5) = 1 * (4/5) = 4/5 man-days.

Now, let's calculate the number of days required for 18 men to complete the work: Total man-days required = Number of men * Number of days. Number of days = Total man-days required / Number of men = 408 / 18 = 22.67 days.

However, we need to account for the reduction in hours per day.

Let's calculate the actual number of days required after the reduction: Actual number of days required = Number of days * (5/4) = 22.67 * (5/4) = 28.33 days.

Therefore, the correct answer is B) 28.33 days.

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