Which Explanation Has Not Been Proposed for the Existence of Sexual

Which explanation has not been proposed for the existence of sexual reproduction?

A) Sexual reproduction facilitates repair of damaged DNA.
B) Sexual reproduction promotes the elimination of deleterious mutations.
C) Sexual reproduction accelerates Muller's ratchet.
D) Sexual reproduction creates a great diversity of genetic combinations that allows populations to adapt to the presence of pathogens.
E) Sexual reproduction maintains genetic variation.