In the Stanford Prison Experiment,male College Students Volunteered to Act

In the Stanford prison experiment,male college students volunteered to act either as guards or as prisoners.In only six days,the guards became cruel and degrading and the prisoners became passive,broke down,or rebelled,The psychologist who devised the study was

A) Fritz Heider.
B) Solomon Asch.
C) Leon Festinger.
D) Philip Zimbardo.