The correct answer is: a) Limestone
Limestone is a sedimentary rock composed of calcium carbonate, the main component of limestone. It is the most common sedimentary rock on Earth, and it is found in significant quantities in Punjab. Limestone is used in a variety of industries, including construction, cement, and agriculture.
Gypsum is a mineral composed of calcium sulfate dihydrate. It is a soft, white mineral that is found in sedimentary rocks. Gypsum is used in a variety of industries, including construction, agriculture, and medicine.
Bauxite is an aluminum ore. It is a red or brown mineral that is found in tropical and subtropical regions. Bauxite is used to produce aluminum.
Coal is a fossil fuel that is formed from the remains of ancient plants. It is a black or brown mineral that is found in sedimentary rocks. Coal is used to generate electricity and to produce steel.