People's prosocial behavior is influenced by:

A) only genes.
B) only experiences.
C) neither genes nor the environment.
D) both genes and the environment.

Prosocial behavior is a complex trait that is influenced by both genes and the environment. Genetic factors play a role in shaping individual differences in empathy, sensitivity to others' needs and emotions, while environmental factors such as family and cultural values, social norms, and experiences also play a significant role in shaping prosocial behaviors. Studies have shown that both genetic and environmental factors contribute to prosocial behavior, with genetic factors accounting for about 50% of individual variability and environmental factors accounting for the other 50%.