All of the Following Are Examples of Postzygotic Reproductive Isolating

Multiple Choice

All of the following are examples of postzygotic reproductive isolating mechanisms EXCEPT:

A) a sheep adapted to mountains mating with a sheep adapted to desert producing offspring maladapted to either habitat.
B) two plant species flowering at different times.
C) the hybrid offspring of two species dying before birth.
D) the hybrid offspring of two species being sterile.
E) the hybrid offspring of two species being fertile but their offspring being inviable or sterile.