單項選擇題活躍期()

A.規(guī)律宮縮至宮口擴張3cm
B.宮口擴張3~8cm
C.宮口擴張3cm至10cm
D.規(guī)律宮縮至宮口開全
E.規(guī)律宮縮至宮口擴張8cm