Social Psychologist Philip Zimbardo Randomly Assigned Participants to Play the Role

Social psychologist Philip Zimbardo randomly assigned participants to play the role of either prison guard or prisoner in a simulated prison for two weeks. What were the results of this simulation?

A) Because the prison guards were not given thorough instructions, most of the prisoners were able to escape.
B) Realizing they were being studied by psychologists, the prison guards were helpful and courteous to the prisoners.
C) The prison guards became so cruel that the study had to be called to an end after only six days.
D) The prisoners became so rebellious and violent they had to double the number of guards in order to maintain control.