20. For the study to be conducted in an ethical manner today, which of the following aspects of the original Milgram study should researchers be most hesitant to implement?

a. The experimenter being physically present in the room with the “teachers”.

b. The experimenter wearing a lab coat.

c. The participants being community members, who tend to be less assertive than college students.

d. The experimenter repeatedly telling the “teachers” that they must continue with the study even after the teachers attempt to withdraw from the study.