The Patient Receives Warfarin (Coumadin)and Becomes Pregnant

The patient receives warfarin (Coumadin) and becomes pregnant.The physician changes her anticoagulant to enoxaparin (Lovenox) .She asks the nurse,"Why did the doctor do that?" What is the best rationale by the nurse?

A) "Because it is easier to maintain your bleeding times in a therapeutic range."
B) "Because warfarin (Coumadin) is known to cause serious cardiac defects."
C) "Because you are less likely to have bleeding with enoxaparin (Lovenox) ."
D) "Because enoxaparin (Lovenox) cannot get into your baby."