If adult male chimpanzee A grooms adult male chimpanzee B, which of the following events would be consistent with the theory of reciprocal altruism? a) Chimpanzee A expects grooming in return b) Chimpanzee B reciprocates the grooming c) Chimpanzee B refuses to groom Chimpanzee A d) Chimpanzee A steals food from Chimpanzee B