(A) Silicon
(B) Rubber
(C) Graphite
(D) None of these
🧠 Explanation:
Lead pencils contain a core made from a mixture of graphite and clay. Graphite is a form of carbon known for its ability to leave marks on paper due to its softness and lubricating properties. The addition of clay adjusts the hardness of the core; more clay results in a harder pencil that produces lighter marks, while less clay makes it softer and darker. This blend allows for varying pencil grades suited for different writing and drawing needs. The name “lead pencil” is historical, as actual lead is not used due to its toxicity. The graphite-clay combination ensures safe, effective, and reliable writing instruments.
