The correct answer is: A) Uranium.
Uranium is a radioactive metal that is used in nuclear power generation. It is found in nature in rocks and minerals. The largest uranium reserves in the world are in Kazakhstan, Canada, and Australia. India also has significant uranium reserves.
Thorium is a radioactive metal that is also used in nuclear power generation. It is found in nature in rocks and minerals. The largest thorium reserves in the world are in India, the United States, and Australia.
Plutonium is a radioactive metal that is not found in nature. It is produced by nuclear reactors. Plutonium is used in nuclear weapons and nuclear power generation.
Coal is a fossil fuel that is used to generate electricity. It is found in rocks and sediments. The largest coal reserves in the world are in China, the United States, and Russia.
Uranium is the only one of these minerals that is used in nuclear power generation.