In the process of nuclear fusion,

a. two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly greater than the original nucleus

b. two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus

c. a heavy nucleus breaks apart into a number of smaller nuclei whose combined mass is less than the original nucleus

d. two or more nuclei fuse or stick together to form a heavier nucleus that has exactly the same mass as the original nucleus

The correct option is B = two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus

Explanation:

Nuclear fusion is another potential source of nuclear energy, in which the nuclei of light atoms are made to combine to form heavier and more stable nuclei with an accompanying release of energy. The energy is due to a slight loss in mass when the heavier nucleus is formed by the fusion of the lighter nuclei. Hence the correct option is b( two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus.The amount of energy per unit mass released during fusion is far greater than that liberated during fission.

     Hydrogen bomb for example was formed as a result of nuclear fusion