Problem: The nurse is caring for a client who has chronic obstructive pulmonary disease (COPD) and is experiencing dyspnea and cyanosis with an SaO2 of 84%. Which of the following actions should the nurse take? Need Assignment Help? A. Apply oxygen 55% via nonrebreather. B. Apply oxygen 40% via Venturi mask. C. Apply oxygen 2 L via nasal cannula D. Apply oxygen 15 L via nasal cannula.