"laboratory studies reveal that a pregnant client's blood type is o and she is rh-positive. problems related to incompatibility may develop in her infant if the infant is: "

laboratory studies reveal that a pregnant client's blood type is o and she is rh-positive. problems related to incompatibility may develop in her infant if the infant is: Rhesus positive. This will lead to Rhesus incompatibility. The development of antibodies in the mother, against Rhesus, can cause fatal problems in the offspring. 

Your answer should be c