The correct answer is (c) Gas.
The KG-D6 basin is a gas field located in the Krishna Godavari basin off the east coast of India. It is one of the largest gas fields in India and has estimated reserves of 10 trillion cubic feet of gas. The field was discovered in 2000 and began production in 2008.
Coal is a solid fossil fuel formed from the remains of ancient plants. It is used to generate electricity, produce steel, and make other products.
Crude oil is a liquid fossil fuel formed from the remains of ancient marine organisms. It is used to produce gasoline, diesel fuel, and other products.
Uranium is a radioactive metal that is used to produce nuclear energy.