Your answer would be A). The behavior of an organism is influenced by both its heredity and it’s environment.
The reason why this would be your answer is because heredity is a passing of a physical or mental trait, which means that the organism would get its physical or mental traits from its parents. Everyone's behavior is different because everyone's brains are developed differently, which causes different behavior. The environment also influences the organism because the environment the organism is around could adapt to what's going on. For example, if a child were to go to a school and was with a bunch of kids that played around too much, the kid would adapt to that and the kids behavior would change because of it.
