Reincarnation is a Hindu belief that the individual soul...
a. Is reborn in a different form.
b. Serves the god Vishnu.
c. Is itself a god.
d. emanates from the Buddha.
Reincarnation is the believe that after this life, one would be born again, but not necessarily in a human form. One could for example be re-born as a cow or an insect.
So the correct answer is A. Is reborn in a different form.