Which of the Following Would Tend to Promote Adaptive Radiation

Multiple Choice

Which of the following would tend to promote adaptive radiation?

A) A single species goes extinct,but it has several competitors that quickly expand to assume its ecological roles.
B) An organism colonizes an isolated area that is habitable but relatively devoid of life.
C) An organism colonizes an area that already has a high level of existing species diversity.
D) An organism has a very stable set of features and capabilities over long spans of evolutionary time.