A Patient Who Was Found Unconscious in a Burning Bedroom

A patient who was found unconscious in a burning bedroom and has burns to the lower legs is assessed by the nurse in the emergency department. The nurse notes that the patient's face is bright red. Which of these actions should the nurse take first?

A) Elevate the legs on pillows.
B) Place the patient on 100% O₂ using a non-breather mask.
C) Assess for singed nasal hair and dark oral mucous membranes.
D) Insert 2 large-bore IV lines.