According to the 'Red Queen Hypothesis

According to the 'Red Queen Hypothesis':

A) Over time, species will gradually progress and become more highly evolved.
B) Variation in a species' gene pool allows that species to keep up with changes in another species, or to co-evolve.
C) Genetic variation is not as important as maintaining power.
D) A population that maintains its genetic variation cannot evolve quickly.
E) A species that starts out with a lot of variation in its gene pool can become less varied over time.