Which statement about nuclear fusion is correct? two hydrogen electrons become protons during fusion. helium nuclei can fuse to form elements such as nitrogen. the fusion reaction lasts for several hundred years. large nuclei break apart to form smaller nuclei.

Helium nuclei can fuse to form elements such as nitrogen.

Explanation:

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

Thus in nuclear fusion , smaller nuclei must combine to form a heavier nuclei. this is a nuclear fusion reaction. Helium nuclei fuse to make carbon, followed by further reactions that produce heavier nuclei such as nitrogen and oxygen.