In Zimbardo's "Stanford Prison Experiment," Young, Psychologically Normal Men Were

In Zimbardo's "Stanford Prison Experiment," young, psychologically normal men were randomly assigned to the role of playing a guard or a prisoner. After five days, the "prisoners" grew withdrawn and unsympathetic, while "guards" became sadistic and brutal. In general, the results of this study probably indicate that:

A) the veneer of civilization is very thin, and the true nature of humans is to be callous and unfeeling
B) the situation is often primarily responsible for behavior, not the personalities of subjects
C) prisoners are basically antisocial and, thus, are unable to cope with the prison environment
D) guards probably choose their profession because they enjoy power and being brutal