please help with general biology I question?

[Tyra B]

Certain whale species were hunted to near extinction. With a moratorium on hunting them, their population sizes have expanded. Which of the following is true?

a. Whale species have a high reproductive rate.
b. The populations may still be endangered because they may have little remaining genetic variation.
c. Hunting can "refresh" a whale species and increase its overall fitness.
d. The populations have recovered and have demonstrated that populations have the potential to recover completely from being driven to near extinction.
e. Hunting is a form of stabilizing selection.