Problems with Using the Biological Species Concept Do NOT Include

Problems with using the biological species concept do NOT include that:

A) it is sometimes difficult to determine if reproductive isolation exists.
B) reproductive isolation does not apply to asexual organisms.
C) the concept of reproductive isolation does not work for fossils.
D) reproductive isolation is not a mechanism that ensures that species are evolving independently.
E) All of these are problems with the biological species concept.