The correct answer is C) Diamond.

• Diamond is the purest form of carbon and is formed deep in the Earth’s crust under high pressure and high temperatures.
• Diamonds are made up of carbon atoms that are tightly packed together in a crystal lattice structure, giving them their unique properties such as extreme hardness and high thermal conductivity.

Additional Information Option Wise

1. Charcoal: Charcoal is a type of carbon that is made by heating wood or other organic materials in a low-oxygen environment. It is not considered a pure form of carbon as it also contains other impurities.
2. Granite: Granite is a type of rock that is composed mainly of quartz, feldspar, and mica, Carbon is not its main component.
3. Diamond: Diamond is the purest form of carbon and is formed deep in the Earth’s crust under high pressure and high temperatures. Diamonds are made up of carbon atoms that are tightly packed together in a crystal lattice structure, giving them their unique properties such as extreme hardness and high thermal conductivity.
4. Graphite: Graphite is a form of carbon that is composed of layers of carbon atoms arranged in a hexagonal structure. It is not as pure as diamond and it is often used in pencils and as a lubricant.

The correct answer is C) Diamond.