A Patient Has a Morphine Sulfate Patient-Controlled Analgesia (PCA)to Control

A patient has a morphine sulfate patient-controlled analgesia (PCA) to control postoperative pain.When the nurse enters the room,the patient complains of pain.The nurse's first response is which of the following?

A) Ask the patient to rate the pain on a 0-to-10 scale.
B) Check the patency of the patient's intravenous line.
C) Call the physician or health care provider immediately.
D) Speak to the patient in a calming tone to reduce anxiety.