Answer:
b. The change in his immediate surroundings changed his likelihood of helping.
Step-by-step explanation:
Pro social behaviors is an intend to help others and considering the society welfare. When Frank has moved from Ohio to New York his views have changed. He is more inclined to prosocial behavior. The immediate change in his surrounding environment has impacted his behavior. This change has resulted in inclination to engage is prosocial behavior. Frank is accepting the society and considering its welfare and trying to help other with whatever he can.