Zimbardo's Prison Study Had to Be Stopped Prior to the End

Multiple Choice

Zimbardo's prison study had to be stopped prior to the end of the scheduled two weeks because _____.

A) the human ethics committee objected to its effects
B) both prisoners and guards were exhibiting alarming changes in behavior
C) the parents of the students who were participating insisted that it be discontinued
D) guards felt guilty about their behavior and asked to stop the experiment