Answer:
A. a nucleus that has a greater mass number than the starting materials
Explanation:
The statement is "a nucleus that has a greater mass number than the starting materials."
Nuclear fusion occurs when two or more atomic nuclei unite to generate one or more new atomic nuclei and subatomic particles.
Two light nuclei fuse to form a single heavy nucleus in a fusion reaction. Because the overall mass of the resulting single nucleus is smaller than the mass of the two initial nuclei, the process releases energy.
Hence, the correct option is A
To more know about nuclear fusion, here,
https://brainly.com/question/12701636
#SPF2