Answer
C.
Work Step by Step
Since bcl-2 acts to repress apoptosis, mutating the bcl-2 gene would likely turn off its activity and allow more apoptosis (C.), which is the opposite of B. A. says that nothing would change, which is not possible when altering the action of a regulatory gene. D. can be eliminated since there is no reason why this mutation would lead to a roller coaster change in apoptosis.
