A Major Ethical Concern Raised About the Milgram Studies Was

A major ethical concern raised about the Milgram studies was that:

A) participants were not aware they were participating in a psychological study.
B) participants were compensated only modestly,given the stress of the experiment.
C) only participants belonging to a particular SES background were recruited for the study.
D) participants learned they were capable of harming another person simply because they ordered.