When the Participants in Milgram's Experiment Received Their Orders Over

When the participants in Milgram's experiment received their orders over the phone, they

A) conformed more completely due to the formality of the telephoned instructions.
B) completely refused to participate in the learning trials.
C) were only slightly more obedient than they were if face-to-face with the authority.
D) were less obedient than they were if face-to-face with the authority.