Currently,two extant elephant species (X and Y)are placed in the genus Loxodonta,and a third species (Z)is placed in the genus Elephas.Thus,which statement should be true?

A)Species X and Y are not related to species Z.
B)Species X and Y share a greater number of homologies with each other than either does with species Z.
C)Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).
D)Species X and Y are the result of artificial selection from an ancestral species Z.
E)Species X, Y, and Z share a common ancestor, but nothing more can be claimed than this.