Which of the Following Events Spurred Social Psychologists to Begin

Which of the following events spurred social psychologists to begin studying the conditions under which people will help another person?

A) The finding that children could be manipulated into being either competitive or cooperative with rivals in the Robbers Cave experiment.
B) The finding that none of the "teachers" in Milgram's obedience studies tried to help the "learner" escape the shock chair.
C) The fact that ordinary people will obey an authority figure even if it means hurting another person.
D) The fact that none of the people who witnessed the murder of Kitty Genovese tried to help her.