Answer:
Jim's motive to help is best explained by "evolutionary theory", while Ivan's motive to help is best explained by "social exchange theory."
Explanation:
Jim's motive is explained by evolutionary theory, as he is going to help his sister. his emotions and behavior is due to the theory of evolution. Where Ivan jumps into the water just because he want to impress his girlfriend, his social behavior is a result of exchange process. He may be thinking that if he help jim's sister his girlfriend thinks good about him.