Why Would Clement VII Not Permit King Henry VIII of England

Why would Clement VII not permit King Henry VIII of England to annul his marriage to Catherine of Aragon and marry Anne Boleyn?

A) Because the Catholic Church does not permit divorce and remarriage under any circumstance whatsoever.
B) Because the pope believed Henry's marriage to Catherine was valid.
C) Because the pope wanted the Tudor dynasty to come to an end.
D) Because Catherine's nephew,Emperor Charles V,controlled Rome at the time and disapproved of Henry's request for an annulment.
E) Because the pope believed such a union would be sinful as Anne was Catherine's sister.