In the Study on Nurses' Obedience,a Man Who Identified Himself

In the study on nurses' obedience,a man who identified himself as a doctor ordered nurses to give twice the maximum acceptable dosage of a drug to a patient.The results of the study demonstrated that

A) the nurses obeyed this order only when they were given the order in person.
B) the nurses obeyed this order only when they knew the doctor.
C) the nurses relied on their judgment and did not obey the order despite the authority of the doctor.
D) the vast majority of the nurses obeyed this order.