A client is to have a cesarean delivery be
题型：单项选择题
问题：
A client is to have a cesarean delivery because of continuous vaginal bleeding and an abnormal fetal heart rate tracing. Which of the following would be the best preoperative medication for this client ？（）
A．Meperidine (Demerol).
B．Oxytocin (Pitocin).
C．Promethazine (Phenergan).
D．Glycopyrrolate (Robinul).