The Nurse Notes a Bright Red Skin Colour for a Client

The nurse notes a bright red skin colour for a client who was found unconscious from smoke inhalation in a burning house. Which of the following actions should the nurse take first?

A) Insert two large-bore IV lines.
B) Check the client's orientation.
C) Place the client on 100% oxygen using a non-rebreather mask.
D) Assess for singed nasal hair and dark oral mucous membranes.