What Is the Consequence of a Deleterious Mutation Becoming Fixed

What is the consequence of a deleterious mutation becoming fixed in a population?

A) Fixation of a deleterious mutation will automatically cause Muller's ratchet to move an additional turn.
B) Recombination cannot remove the mutation.
C) Mating between unrelated individuals can produce offspring that do not carry the mutation.
D) Muller's ratchet can no longer turn.