Which Statement About Reciprocal Altruism Is Most Accurate

Multiple Choice

Which statement about reciprocal altruism is most accurate?

A) Reciprocal altruism is a strictly human phenomenon and observed only in mature adults.
B) Reciprocal altruism is a strictly human phenomenon that has been observed throughout the lifespan.
C) Reciprocal altruism occurs in humans and non-human primates but not in non-primate animals.
D) Reciprocal altruism has been demonstrated in non-human primates as well as non-primate animals.