Please Read the Clinical Scenario, and Then Answer the Question

Multiple Choice

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
Marian is a 28-year-old woman who is 30 weeks' pregnant with her second child. Her first pregnancy and delivery was uncomplicated, and she now has a healthy 2-year-old girl. However, it is known that she is Rh-, and this child could be at risk for hemolytic disease of the newborn. She did receive RhoGAM with her first pregnancy. She presents to your maternal-fetal medicine clinic for a checkup, as she is a medium-risk pregnant mom.
-Which factor would increase the risk of the unborn child being Rh+?

A) previous child being Rh-
B) father being Rh+
C) history of preexisting type I hypersensitivity
D) both maternal grandparents being Rh-