A client with hypotonic labor dysfunction is receiving oxytoein augmentation. Her contractions become more frequent and intense. Dilation progresses to 8 cm, but the fetal head remains at station +1. The nurse notes a soft bulge just above the symphysis. Which of the following actions is best ？（）
A．Re-evaluate the fetal presentation.
B．Change the client’s position.
C．Offer a narcotic analgesic.
D．Help the client urinate.
