The participants in philip zimbardo's simulated prison study:

a. were assigned the roles of prisoner or guard on the basis of their personality test scores.
b. found it very difficult to play the role of prison guard.
c. were so endangered by their role-playing experience that the study was discontinued.
d. became a cohesive unit when they pursued superordinate goals.

C. were so endangered by their role-playing experience that the study was discontinued

Explanation:

In 1973, Philip G Zimbaro conducted an experiment to investigate the brutal behavior of the American prison guards because of their sadistic tendencies. Zimbardo used college students to act prisoners or guards in a simulated prison environment. But the brutalities on prisoners increased so high that Zimbardo had to discontinue the experiments only after six days.

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