The nurse notices the fetal heat rate tracing suddenly shows a prolonged deceleration. On perineal inspection, the nurse observes the umbilical cord has prolapsed. What is the nurse's priority action?

Rationale: A. Performing a vaginal exam to manually lift the presenting fetal part off the prolapsed umbilical cord relieves pressure and restores blood flow—this is the immediate priority. B. Turning the client to the left side helps improve circulation but is secondary to relieving cord compression. C. Attempting to replace the cord is not recommended as it can cause trauma and worsen the situation. D. Covering the exposed cord prevents drying but does not relieve pressure and is not the first priority.