The Nurse Assesses a Patient's Pain Level to Be an 8

The nurse assesses a patient's pain level to be an 8 on a 0-to-10 scale. The nurse notes the patient has an order for morphine 4 mg IV as needed for pain. The patient's blood pressure is 80/54 mm Hg, respirations 10 breaths/min, and pulse 64 beats/min. Which action should the nurse take?

A) Tell the patient he cannot have any more pain medication.
B) Administer half the dose of morphine, 2 mg IV.
C) Administer 4 mg of morphine IV as ordered.
D) Notify the RN.