Which of the Following Statements Is True About Milgram's Follow-Up

Which of the following statements is true about Milgram's follow-up studies?

A) Women were less likely than men to inflict shock to the 450 volt maximum.
B) When the experiment was moved a commercial location not connected to a university, fewer than 20% of participant cooperated to the 450 volt maximum.
C) When the teacher was required to place the learner's hand on a shock plate, 30% of participants still participated to the 450 volt maximum.
D) Even when a confederate posed as another participant and defied the experimenter, 20% of participants still participated to the 450 volt maximum.