Under which of the following conditions is a population most
likely to evolve a bimodal distribution?
A) Selection favors multiple distinct trait values, and similar
individuals tend to mate with each other.
B) Traits are strongly correlated, and a low carrying capacity
keeps the population size small.
C) Environmental conditions change rapidly, and a low mutation
rate limits the establishment of new variants.
D) Selection is weak, and individuals produce large numbers of
offspring each generation.