Which statement about mutualisms is false?

A. For an ecological interaction to be a mutualism, the net benefits must exceed the net costs for one partner but not the other.
B. Species do not engage in mutualisms for altruistic reasons.
C. In some mutualisms, one or the other partner, under certain environmental conditions, will withdraw the reward it usually provides.
D. There is an inherent conflict of interest between the partners in a mutualism.