Computers are made of plastics. Plastics like thermosetting which remain permanently hard after being formed and cooled are used in constructing the body.

A bullock cart, door and boat all can be formed by wood. A bullock cart is used to transport goods from one place to another in villages is made of wood only. Doors can be made of wood, glass or metals and small boats are also made of wood preferentially. 

Clothes are made of Fibres.

Quilt, bedsheet and clothes all are made from cotton. Utensils, frames and furniture are made from metals. Crockery, vase and decorative articles are made from glass and jewellery, ornaments and jewellery box are made of metals as gold or silver in which gems are used to decorate them.

Among these the objects which can be made fro wood are-

Cart (Bullock-cart), wheels and plough are made of wood.

Few parts of the computer are made of plastics and few from metal.

Plates that are used frequently are made of steel or glass whereas disposable plates are made of plastics. Hence answer is option D.

The objects that are made from leather are wallet, jacket, belt, purse, office bag etc.

A plastic is any material that can be shaped or molten into any form,

Rontgen discovered X-rays.
Dalton proposed the postulates of Atomic Theory.
Rutherford discovered $\alpha$ and $\beta$ and also [performed the Gold-foil experiment for the discovery of the nucleus.
Laveziour attempted to give the explanatory definition of elements and stated that element is the basic unit of substance.

The option $C$ contain the objects made up of by same material that is plastic .

Sublimation is the process where a solid directly converts into gas without reaching liquid state.
Ammonium chloride is the solid which directly converts into gas on heating.

Plastic is a very useful polymer. It is used on a large scale for production of various articles. Buckets, tables, plates, chairs, bottles are few examples of articles made of plastic. Hence answer is option D.

Steel is an important alloy of ions that is used on a very large scale in modern industry due to its high durability and strength. It is also used to manufacture tables, chairs, cupboards, fans, utensils,etc. Thus answer is option D.

Solid carbon dioxide is called dry ice. Because it looks like ice and because when it melts (it actually sublimes) it goes from solid straight to gas, no liquid, hence dry ice.
Hence option A is correct.

Electric wires, coils and machines are made of hard metals. Sodium is a very soft metal which can be cut through knife hence it cannot use to prepare electric wires, coils and machines.