Common baboons live on the savanna in breeding groups called troops. While females tend to stay with the troop, younger or less dominant males may leave to join a neighboring troop. This is an example of

A. Natural Selection

B. Genetic Drift

C. Gene Flow

D. Mutation

E. Mating Preference

C. Gene Flow

Gene flow refers to the exchange of genes between different populations, typically through the movement of individuals between them. In the case of baboons, the younger or less dominant males leaving to join a neighboring troop contributes to gene flow between different troops.