Biologist: Some speculate that the unusually high frequency of small goats found in island populations is a response to evolutionary pressure to increase the number of goats so as to ensure a diverse gene pool. However, only the reproductive success of a trait influences its frequency in a population. So, the only kind of evolutionary pressure that can reduce the average size of the members of a goat population is that resulting from small goats achieving greater reproductive than their larger cousins. The biologist's view, if true, provides the most support for which one of the following?
A: Contrary to what some believe, large goats achieve greater reproductive success than small goats even when space is limited.
B: The evolutionary pressure to ensure a diverse gene pool does not have the effect of increasing the frequency of a gene for small size.
C: The evolutionary pressure to ensure a diverse gene pool could have the effect of increasing the frequency of a gene for small size.
D: A diverse gene pool cannot be achieved in a goat population unless the average size of its members is reduced.
Choose A, B, C or D as your solution.
B