A Client with COPD Has Severe Shortness of Breath at Rest

A client with COPD has severe shortness of breath at rest and arterial oxygen tension (PaO₂) of 35 mm Hg. When oxygen via nasal cannula is prescribed, the nurse would assess the client cautiously because

A) regulating oxygen settings can be done by unlicensed staff.
B) some clients with COPD have CO₂ narcosis.
C) skin damage under the nasal cannula is common.
D) the client may try to sneak a cigarette and get burned.