The correct answer is: a) Petroleum.
Petroleum is a fossil fuel formed from the remains of ancient organisms. It is a liquid that is found in underground reservoirs. Petroleum is a valuable resource because it can be used to produce gasoline, diesel fuel, and other products.
Lignite coal is a type of coal that is formed from plant material that has been buried and subjected to heat and pressure for millions of years. Lignite coal is the lowest grade of coal and is not as valuable as other types of coal.
Uranium is a radioactive metal that is found in nature. Uranium is used to produce nuclear energy.
Natural gas is a fossil fuel that is formed from the remains of ancient organisms. Natural gas is a gas that is found in underground reservoirs. Natural gas is a valuable resource because it can be used to produce electricity and heat.
Assam is a state in India that has significant reserves of petroleum. The petroleum reserves in Assam are located in the Brahmaputra Valley. The petroleum reserves in Assam are estimated to be about 1.2 billion barrels. The petroleum reserves in Assam are a valuable resource for India. The petroleum reserves in Assam can be used to produce gasoline, diesel fuel, and other products. The petroleum reserves in Assam can also be used to generate electricity.