Cindy Alaniz, age 25 years, has come to the health center to have her routine annual Pap and pelvic examination. During her interview, she tells you that her menstrual periods have been heavier than normal for the past 6 months and that she has been passing clots about the size of a nickel on the first day of each cycle. She denies cramping with her menses. She is currently taking no medications. She exercises but says that lately she has stopped this practice because she feels "tired all the time." Her diet is high in pasta foods, some fruits, and vegetables, and she eats meat only once each month in an attempt to limit her fat content. She has episodes of dizziness, which she describes as "feeling weak".

After 6 months, Ms. Alaniz has improved her diet and has normal blood levels. She and her husband have decided to become parents but are concerned because Ms. Alaniz is Rh positive whereas her husband is Rh negative. Which one of the following is your best response?
A. she and her husband should be very concerned and not have children because the child will have a disease called erythroblastosis fetalis
B. she and her husband should be concerned, but because this is their first child it will not be affected
C. she and her husband do not have to worry. RhoGAM administered to the mother can prevent the complications
D. she and her husband do not need to worry about Rh problems because she is not Rh negative