A 21-year-old primigravida has an emergenc
题型：单项选择题
问题：
A 21-year-old primigravida has an emergency cesarean delivery under general anesthesia because of unanticipated fetal distress. One postoperative intervention is to assist her to turn every 2 hours. Which of the following conditions is this intervention intended to prevent
A. Pressure ulcers.
B. Muscular stiffness.
C. Respiratory complications.
D. Venous stasis.