The Adult Patient Who Receives Morphine Sulfate Intravenously by Patient-Controlled

The adult patient who receives morphine sulfate intravenously by patient-controlled analgesia (PCA) tells the nurse that the pain level is 8 on a scale of 0-10.Which is the best intervention for the nurse?

A) Check the volume of morphine in the PCA syringe.
B) Check the frequency of patient-controlled dosing.
C) Collaborate with the provider to increase basal rate.
D) Check the PCA pump for malfunction.