D. The fetus should be evaluated with heart rate monitoring because PROM increases the risk of umbilical cord prolapse and fetal distress caused by oligohydramnios.

• 因为胎膜早破可致羊水过少从而增加脐带脱垂和胎儿窘迫的危险，故应做胎心监测观察胎儿情况。