Answer:
B. uranium
Step-by-step explanation:
Uranium is a radioactive element and is used as a fuel in nuclear power plants. It releases a large amount of energy due to nuclear fission. In nuclear fission, very heavy atomic nucleus divided into two parts by the collision of a particles.
The uranium nucleus has an average energy of 7.6 MeV (electron volt) per nucleon. Since the uranium nucleus has 235 nucleons, it releases about 210 MeV is per fission.
Coal, petroleum, natural gas are fossil fuel. They do not produce less energy as compared to radioactive elements such as uranium, thorium.