Studies of the Columbines Aquilegia Formosa and A

Studies of the columbines Aquilegia formosa and A. pubescens illustrate that

A) hybrids rarely form between these species because the two species are not interfertile.
B) hawkmoths prefer one species over the other because of differences between the species in the color of light that they emit.
C) hawkmoths show equal preference for the two species if the flowers of A. formosa are turned upright.
D) All of the above
E) None of the above