A primipara, 40 gestational weeks, paroxysmal abdominal pain last 10 hours. Examination: fetal position was LOA，fetal presentation had fixity, fetal heart rate was 150bpm.She had adequate uterine contractions. Examination: the cervix was dilate 175px, S=0 with with ruptured membranes and 5 hours later the cervix was still dilate 175px, S=0, the diagnosis was:
选项：

A:prolonged latent phase;
B:protracted active phase;
C:prolonged active phase;
D:protracted latent phasee;
E:Active phase arrest