Which of These Statements Is True of Milgram's Research

Which of these statements is true of Milgram's research?

A) Women were less likely to obey the experimenter than men.
B) Only people in certain cultures are likely to obey the experimenter.
C) The experimenter never made it clear what the penalty to the participant would be for disobedience.
D) Research suggests that rates of disobedience have gone down in recent decades.