In Evolutionary Models, Where Each Individual Reproduces in Proportion to Its

In evolutionary models, where each individual reproduces in proportion to its average payoff, if cooperators and defectors look exactly alike, then

A) Cooperators are destined for extinction
B) Defectors are destined for extinction
C) An equilibrium will result with more than half of the population being cooperators
D) There will be no change in the population proportions from the starting point