Based on the Information in the Accompanying Figure Obtained for a Patient

Based on the information in the accompanying figure obtained for a patient in the emergency room,which action will the nurse take first?

A) Administer the prescribed morphine 4 mg IV.
B) Contact the operating room to schedule surgery.
C) Check the patient's O₂ saturation using pulse oximetry.
D) Ask the patient about the date of the last tetanus immunization.