What Did Stanley Milgram Find in His Work Which Supports

What did Stanley Milgram find in his work which supports the notion that the perception of authority is important for promoting obedience?

A) He found that the vast majority of people were unwilling to shock the confederate.
B) He found the same rates of obedience when he conducted the study at Yale University as when he conducted the study at a lab with no affiliation to Yale.
C) He found that obedience rates were higher when the person in charge looked like a scientist compared to when he was perceived to be another 'participant'.
D) He found the same rates of obedience when the person in charge looked like a scientist as when he was perceived to be another 'participant'.