The correct answer is: A. Gypsum
Gypsum is a mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and used in a variety of applications, including plaster, drywall, and fertilizer.
Coal is a fossil fuel formed from the remains of ancient plants that have been buried and subjected to intense heat and pressure over millions of years. It is a major source of energy, and is used to generate electricity, power vehicles, and heat homes and businesses.
Limestone is a sedimentary rock composed primarily of calcium carbonate. It is a common building material, and is also used in the manufacture of cement, lime, and other products.
Borax is a mineral composed of sodium borate, with the chemical formula Na2B4O7·10H2O. It is a white, water-soluble solid that is used in a variety of applications, including glassmaking, ceramics, and detergents.
Kalakote is a town in the Indian state of Jammu and Kashmir. It is located in the Poonch district, on the banks of the Chenab River. The town is known for its gypsum mines, which are the largest in the state.