In a Model of the Development of Evolutionarily Stable Behaviours

In a model of the development of evolutionarily stable behaviours, a 'hawk' strategy means the animal will always fight while a 'dove' strategy means the animal only displays, but will not fight. An evolutionarily stable mixture will occur when

A) most of the population consists of 'hawks'.
B) most of the population consists of 'doves'.
C) the average payoff to 'hawks' and 'doves' is equal.
D) there are equal numbers of 'hawks' and 'doves'.
E) the number of hawks and doves will depend on seasonal influences.