Answer:
Environment
Step-by-step explanation:
B.F Skinner was of the belief that the environment of a person drove or influenced his behavior. His opinion was that human beings have a particular way of behaving which requires special kinds of responses and that as this goes on, humans will adapt and start behaving in a certain kind of way.
He strongly believed that because we learn things differently and in different environments, that is why there are differences in human behavior and one's environment can shape his personality.