The correct answer is A) Coal.
Singareni Collieries Company Limited (SCCL) is an Indian state-owned coal mining company based in Hyderabad, Telangana. It is the largest coal mining company in India and the eighth largest in the world. SCCL produces about 60 million tonnes of coal per year, which accounts for about 10% of India’s coal production.
Coal is a fossil fuel that is formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years. It is a major source of energy in the world, and is used to generate electricity, produce steel, and power transportation.
Limestone is a sedimentary rock that is composed primarily of calcium carbonate. It is a major source of lime, which is used in a variety of industries, including construction, agriculture, and manufacturing.
Gold is a precious metal that is used in jewelry, coins, and other decorative items. It is also used in electronics and dentistry.
Copper is a reddish-brown metal that is used in a variety of industries, including construction, electronics, and transportation.