下列在第一产程期中适宜进行肥皂水灌肠的是

A．经产妇头位，宫口开大3cm未破膜

B．初产妇头位，宫口开大3cm未破膜

C．初产妇头浮，胎膜早破

D．臀位，未破膜

E．经产妇伴肺动脉高压，宫口开大1cm