Which Statement Correctly Characterizes One Aspect of Stanley Milgram's Study

Which statement correctly characterizes one aspect of Stanley Milgram's study of obedience?

A) Subjects were shown an ominous-looking shock machine that was marked 0 to 450 volts.
B) Participants in the study were randomly assigned to be teachers or learners.
C) Participants were shocked when they made errors in reciting word pairs.
D) A learner and the teacher sat side by side across from the shock machine.
E) Participants were assigned to "play" a prison guard or a prison inmate.