Inclusive fitness refers to

A) an individual's personal reproductive success, as well as that of his or her relatives.
B) an individual's personal reproductive success only.
C) the reproductive success of an individual's relatives only.
D) the reproductive success of the population as a whole.
E) the reproductive success of a species from generation to generation.

Inclusive fitness is a measure of an individual's overall reproductive success, including their own direct fitness (the production of offspring) and indirect fitness (the reproductive success of relatives who share similar genetic material). This concept is often used to explain altruistic behavior in animals, as it suggests that individuals may engage in behaviors that benefit relatives in order to increase their own inclusive fitness.