Which of the Following Briefly Describes the Classic Research on Social

Which of the following briefly describes the classic research on social roles led by Philip Zimbardo in the 1970s?

A) having the teacher administer shocks of increasing strength to a learner upon every incorrect response
B) asking for $40 when you really only need $10
C) having some college students act as guards and having some act as prisoners in a make-believe prison
D) having subjects select which line of three most closely resembles the standard line