The correct option is A
Stanley Milgram was a graduate psychologist at Yale University who conducted the experiments of the small world (the source of the concept of the six degrees of separation) and the Milgram Experiment on obedience to authority. Although considered one of the most important psychologists of the twentieth century, Milgram never studied psychology during his studies of political science at Queens College, New York, where he graduated in 1954. He attended a postgraduate course in social psychology at Harvard University and was rejected initially because of lack of psychology studies. He was accepted in 1954 after taking six psychology courses and graduated in 1960.