Which of the following energies is released during a nuclear fusion reaction?

• An atom's dense nucleus contains a huge amount of energy which is called nuclear energy.
• A tremendous amount of nuclear energy is released during nuclear fusion and nuclear fission reactions.
• In a nuclear fusion reaction, two atoms combine together to create an atom.
• In nuclear fission, the nucleus of an atom splits into two or more smaller nuclei.

Therefore, nuclear energy is the correct response.