Which of the Following Best Explains Why Philip Zimbardo Stopped

Multiple Choice

Which of the following best explains why Philip Zimbardo stopped the experiment when he did?

A) His role in the study made him more aware of the participants' suffering.
B) A graduate student assistant told him she thought what he was doing was terrible.
C) The debriefing of the participants made him question his treatment of the guards and prisoners.
D) His personal belief system about prison life caused him to question his study.