Which of the Following Choices Explains a Dominance-Controlled Community

Which of the following choices explains a dominance-controlled community?

A) Species are competitively equivalent. As a result, all species colonize a site and maintain their presence. Thus, species richness is high.
B) Species are not competitively equivalent. This means that some species will be able to colonize a site and maintain their presence, but some will not be able to do so.
C) Species can either be early species or later species, but ultimately regardless of which type of colonizer they are, each will be competitively equivalent.
D) Primary dominance is determined by density-dependent factors. As a result, the species richness is high.