Based on Stanley Milgram's 1970s Experiments with Authority and What

Based on Stanley Milgram's 1970s experiments with authority and what is known about the genocide during the Holocaust,which of the following people are most likely to harm a stranger if an authority figure tells them to?

A) people who are in the same room as a victim whom they can see and hear
B) people who are in a different room from a victim whom they can see and hear
C) people who are in a different room from a victim whom they can see but not hear
D) people who are in a different room from a victim whom they can neither see nor hear