Starting from a single wild canine species, humans have developed hundreds of breeds of domestic dogs. Which statement is supported by this observation?
A.
There was enough inherited variation in the wild for canine species to create a variety of features.
B.
Most of the variation in domestic dog species is a result of variation in nutrition and training.
C.
Natural selection had not occurred very frequently in the wild dog populations.
D.
Heritable variation is low; otherwise, there would be more wild dog species.