In writing Pencil . . . . . . . . is used A. solid ink B. lead C. lead sulphate D. graphite

The correct answer is: Graphite.

Graphite is a form of carbon that is used in pencils. It is a soft, black material that is made up of tiny flakes. When you write with a pencil, the graphite flakes rub off onto the paper and leave a mark.

Lead is a heavy metal that is not used in pencils. It is poisonous and can be harmful to your health.

Lead sulphate is a chemical compound that is used in some types of batteries. It is not used in pencils.

Solid ink is a type of ink that is made up of tiny particles of pigment. It is used in pens and markers.

In conclusion, the correct answer is: Graphite.