Males are more likely to suffer from muscular dystrophy than females because

"Males who inherit the mutation get the disease because they have no second dystrophin gene to make up for the faulty one. Early in the embryonic development of a female, either the X chromosome from the mother (maternal X) or the one from the father (paternal X) is inactivated in each cell."

(courtesy https://www.mda.org)

The answer is B for the first one, and C for the second.

Let me know if you need an explanation.

Hope this helps!