A Woman Is Having Her First Child

A woman is having her first child.She has been in labor for 15 hours.A vaginal examination performed 2 hours earlier revealed the cervix to be dilated to 5 cm and 100% effaced,and the presenting part of the fetus was at station 0;however,another vaginal examination performed 5 minutes ago indicated no changes.What abnormal labor pattern is associated with this description?

A) Prolonged latent phase
B) Protracted active phase
C) Secondary arrest
D) Protracted descent