The High Levels of Obedience in the Milgram Experiments Are

The high levels of obedience in the Milgram experiments are least likely to be attributable to

A) the perceived legitimacy of the commanding authority figure.
B) an aspect of gender-related behavior found only in males.
C) the placement of "teacher" and "learner" in separate rooms.
D) the very gradual increase in shock level ordered after each new learning error.