A) "We believe X is wrong because it was selectively advantageous to do so; furthermore, X is really a fundamentally bad thing."
B) "We believe X is wrong because it was selectively advantageous to do so. Given this, our natural impulses and common social structures make it reasonable to believe that X is wrong, even if we don't exactly agree on what the definition of 'really wrong' is, or even whether wrongness is a feeling, a social construct, or a universal absolute."
C) "We believe X is wrong because it was selectively advantageous to do so. Had we evolved differently, we may have thought X right. In neither case would we be incorrect - morality has no meaning besides that which we have, due to the amoral workings of nature, imposed on it.
D) "We believe X is wrong because God says so, and God is the source of all morality. Because God is good, that it was selectively advantageous to believe X is wrong is, of course, expected - it was part of a greater Divine Plan."
E) "We don't really believe X is wrong, but it's useful to say so. We evolved to be good at that."