Suppose That a Consistent Principle Has Been Used to Divide

Suppose that a consistent principle has been used to divide a genus into three jointly exhaustive species.Might it be possible to divide the same genus into only two jointly exhaustive species by using a different consistent principle?

A) Yes, because a genus may be divided many different ways.
B) Yes, because every genus will neatly divide in half.
C) No, because there is only one consistent way to divide each genus.
D) No, because every consistent way of dividing a genus results in the same number of species.
E) It would depend on whether the number of referents is divisible by six.