In perhaps the most famous study ever conducted in social psychology, approximately of men studied were willing to administer a lethal shock of electricity to a victim when they were ordered to do so by a person who appeared to be in a position of authority.

two-thirds

Explanation:

In the 60s, social psychologist Stanley Milgram conducted a series of experiments where he thought he found the answer to atrocities such as the Holocaust. His conclusion was that humans are capable of the worst when we are following orders from an authority. The vast majority of participants did not have any qualms about managing the downloads to a maximum of 450 volts.

the actual answers are a, b, and d.