In a Variation in the Original Procedure of the Experiment

In a variation in the original procedure of the experiment by Stanley Milgram, the experimenter was not present in the room, but communicated with the teacher by telephone. In this condition the obedience of the experimental participant

A) was reduced substantially.
B) did not change because the experimenter was still most salient.
C) increased because the participant demonstrated psychological reactance.
D) increased because the participant felt more free to shock.