The Nurse Finds a Postoperative Patient Perspiring with Fist Clenched

The nurse finds a postoperative patient perspiring with fist clenched upon entering the room.The nurse administers routine medication and provides care.The patient is pleasant and cooperative.Which action by the nurse is appropriate?

A) Asking the patient if pain is being experienced
B) Instructing the patient to use the call bell if he experiences pain
C) Informing the patient that he looks uncomfortable and asking him to describe his pain
D) Documenting "no complaints of pain offered" and assessing that the patient is comfortable