If a Woman Is a Carrier for the X-Linked Recessive

If a woman is a carrier for the X-linked recessive colorblindness and her husband is normal,what are their chances that a son will be colorblind?

A) 25%,since the mother is a carrier
B) 100% because the mother has the gene
C) 50%,since the mother is a carrier
D) None,since the father is normal
E) None,since he will be also a carrier