Participants in Milgram's obedience experiments were informed that they were involved in a study of

A) aggression.
B) altruism.
C) learning.
D) visual perception.

Milgram's obedience experiments focused on studying learning and obedience, specifically how far individuals would go in obeying authority figures even if it meant causing harm to another individual. The experiments were not focused on aggression or altruism, although those concepts may have indirectly played a role in the behavior of the participants. Visual perception was also not a primary area of study in the experiments.