Which is a product of nuclear fusion?
a nucleus that has a greater mass number than the starting materials
two nuclei that are roughly half the mass of the starting materials
a nucleus that has the same atomic number as the starting materials
two nuclei that have greater atomic numbers than the starting materials

a nucleus that has a greater mass number than the starting materials

Explanation:

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.

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