Red-green color blindness is caused by an X-linked recessive gene. In a family, the mother is a carrier of this gene while the father does not have the gene. What are the possible effects on their children? Select one of the options below as your answer:
A. Half of the daughters are normal and half of the daughters are color-blind.
B. Half of the boys are normal and half of the boys are color-blind.
C. Half of the boys are color-blind and half of the girls are color-blind.