Which of the following is a true statement?

A. Very few studies have explored the role of competitive interactions in adaptive radiation.

B. Intense intraspecific competition with small variations in local populations will always lead to local extinctions.

C. Resource competition is often a primary factor driving phenotypic convergence.

D. There have been no experiments that support the idea that predation may lead to adaptive radiation.

E. The different biotic interactions local populations experience throughout a species' geographic range could function as mechanisms of adaptive radiation.