Which statement concerning fusion is correct?

Question

Quizplus · Accepted Answer

Fusion requires the formation of a plasma of unbound nuclei and electrons, which can only occur at extremely high temperatures and pressures. Large nuclei are often used as reactants to facilitate fusion reactions. Fusion reactions can release large amounts of energy once sustained, but they require significant energy input to initiate. The products of fusion reactions may or may not be radioactive, depending on the specific nuclei involved.

Which Statement Concerning Fusion Is Correct