In Humans, the Allele for Red-Green Color Blindness Is X-Linked

Multiple Choice

In humans, the allele for red-green color blindness is X-linked and recessive (X^r; the dominant allele is called X^R) . A man with normal color vision marries a color-blind woman who gives birth to a color-blind daughter. From this, we can tell that

A) the woman is X^RX^r.
B) the man must be a carrier for the color blindness allele.
C) the daughter must be heterozygous.
D) the man is probably NOT the father of the daughter.