Which statement best compares pioneer species with climax communities?

A]Both are involved with stages of succession, but climax communities are the beginning and pioneer species are the end result.
B]Both are involved with stages of succession, but pioneer species are the beginning and climax communities are the end result.
C)The appearance of each indicates that the number of species in the area is increasing.
D)The appearance of each indicates that the number of species in the area is decreasing.