Despite the Variety of Sizes, Shapes, and Colors, a Male

Multiple Choice

Despite the variety of sizes, shapes, and colors, a male German Shepherd and a Great Dane (two breeds of dogs) can mate with one another and produce offspring. Do these dogs belong to the same species?

A) yes, because they can interbreed
B) no, because they each have evolutionary novelties not shared by the other breed
C) no, because they are different dog breeds
D) yes, because they share physical similarities