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【单选题】
初产妇；29岁，孕39。最近3天有不规则腹痛，于昨晚出现阴道流血，少于月经量，未入院。今天中午孕妇感觉腹痛规律，检查：每5~6分钟一次，每次持续约40秒，开大2cm，枕先露，胎膜未破。接生时，为该产妇开始保护会阴的时机是A.
经阴道外口看到胎发时
B.
胎头开始着
C.
胎头拨露阴唇后联合紧张时
D.
胎头时
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