A large island is devastated by a volcanic eruption. Most of the horses die except for the heaviest males and heaviest females of the group. They survive, reproduce, and perpetuate the population. If weight is a highly heritable trait, which graph represents the change in population before and after the eruption?

(A) A higher mean weight compared with their parents

(B) A lower mean weight compared with their parents

(C) The same mean weight as members of the original population

(D) A higher mean weight compared with members of the original population