A Sterile Mule Is Produced by Mating a Horse and a Donkey.From

A sterile mule is produced by mating a horse and a donkey.From this observation you could conclude:

A) That horses and donkeys are the same species
B) That horses and donkeys are different species
C) That mules are a result of macroevolution
D) Increasing the number of mules in a population will affect the allele frequency in the next generation
E) The DNA sequences of horses and donkeys are more than 97% identical