The correct answer is A) Coal.
The Singareni Collieries Company Limited (SCCL) is a state-owned coal mining company in India. It is the largest coal mining company in India and the second largest coal mining company in Asia. The company was founded in 1956 and is headquartered in Hyderabad, Telangana. SCCL has a total of 13 mines in Telangana and Andhra Pradesh. The company produces about 60 million tonnes of coal per year.
Coal is a fossil fuel that is formed from the remains of ancient plants and animals. It is a non-renewable resource and is used to generate electricity, produce steel, and make other products. Coal is a major source of greenhouse gases, which contribute to climate change.
The other options are incorrect because they are not primary products of SCCL. Copper is a metal that is used to make electrical wires, pipes, and other products. Limestone is a rock that is used to make cement and other products. Gold is a precious metal that is used to make jewelry and other products.