D's Burden of Proof in Order to Rebut a S75

D's burden of proof in order to rebut a s75 presumption in relation to consent is which of the following:

A) That D must simply deny that V was non-consenting.
B) That D must establish belief in V's consent beyond all reasonable doubt.
C) That D must establish on a balance of probabilities that he reasonably believed in consent.
D) That D must totally destroy the credibility of the victim.