Which of the Following Best Describes Resource Partitioning

Which of the following best describes resource partitioning?

A) competitive exclusion that results in the success of the superior species
B) slight variations in a species's niche that allow similar species to coexist
C) two species that can coevolve to share an identical fundamental niche
D) decreases in community species diversity due to differential resource use
E) climax community that is reached when no new niches are available