The misnomer that sibling rivalry is a thing of the 'past' history- where brothers slit each other's throats in a gory race to kinghood - can and does not seem appalling; but still does.

A. can and does not seem appalling; but still does.
B. can and does seem appalling; but still does not.
C. should and does seem appalling; and still does.
D. can and do not seem appalling; but still do.
E. may and does seem appalling; but still doesn't do so.

Can some experts give me a detailed explanation on the best option?I don't see wrong in option D.

OA C