Which factors can affect an animal's behavior?

The chosen response highlights the comprehensive influences on an animal’s behavior. Genetics play a crucial role in determining innate traits and predispositions, influencing how an animal reacts to various stimuli. The environment provides the context in which these traits are expressed or modified; for instance, an animal raised in a stimulating environment may develop different behaviors compared to one in a deprived setting.

Additionally, past experiences play a significant role in shaping behavior. An animal’s history, including social interactions, training, and exposure to different situations, contributes to its behavioral responses. This integration of genetics, environmental factors, and personal history allows for a full understanding of an animal's behavior, illustrating the complexity of the interactions that define how each individual responds to the world around them.

In contrast, the other choices fail to encompass the full range of influences. Some limit the scope to only genetics and environment, while others exclude critical facets such as past experiences that significantly shape behavior.