This is a photo of a wolf-dog. This animal is the offspring of a gray wolf and a domesticated dog, the German shepherd. The wolf-dog you see here can breed and have pups. What conclusion can you make about the wolf and the German shepherd?

A) They are in the same classification domain.
B) The two animals are members of the same species.
C) The wolf and the dog must have similar reproductive cycles,
D) The wolf and the dog are closely related because they are both mammals.