Which Statement Is Helpful in Understanding the Nature of Rh

Which statement is helpful in understanding the nature of Rh incompatibility?

A) It is worse for a woman who is having her first pregnancy.
B) It is a disorder that can be treated through surgery when the fetus is in the uterus.
C) It is a problem that inflicts approximately 90% of Canadian couples.
D) It causes a mother's body to produce antibodies that attack the fetus and can lead to brain damage or death.