The Research Evidence for Reciprocal Altruism Provides Support for the Claim

The research evidence for reciprocal altruism provides support for the claim that:

A) individuals are willing to help if they can ultimately receive something in return.
B) altruism has an evolutionary basis such that a person is more likely to help kin.
C) altruism is primarily a psychological phenomenon, rather than a biological phenomenon.
D) research has no bearing on cross-cultural findings related to the basis to altruism.