The Nurse Is Caring for an Rh-Negative Mother on the Postpartum

The nurse is caring for an Rh-negative mother on the postpartum unit.What scenario indicates the need to administer RhoGAM to this patient?

A) She has had one Rh-negative child and is pregnant with an Rh-negative child.
B) She has had an Rh-positive infant and is pregnant with an Rh-positive fetus.
C) She has had an O-negative child and is pregnant with a B-negative child.
D) She is a primipara with an O-negative child.