How are nuclear reactions used to meet the world’s energy needs?

Fission is used in operating nuclear power plants to generate electricity. Fusion can release energy, but it has not yet become practical for commercial electricity generation, so fusion reactors are not currently supplying power to the grid. Therefore, the correct choice is “Fission reactors are used to generate electricity, but fusion is not yet practical enough to be used.”

AI-written and checked against the verified answer.