Erythroblastosis fetalis may develop when-

a. Rh(+) mother carries Rh(+) fetus
b. Rh(-) mother carrier Rh(-) fetus
c. Rh(+) mother carries Rh(-) fetus
d. Rh(-) mother carries Rh(+) fetus

Correct Answer: d. Rh(-) mother carries Rh(+) fetus