Face mask Arterial blood gas

A patient is receiving oxygen 60 % via a simple face mask arterial blood gas results are PH 7.31, Pao2 , 99mmag . Paco2 51 , Bicarb 28 meq/1 . which of the following actions would the nurse implement ? A. Request the lab to repeat the test B. Place the patient on the partial rebreather face mask C. Administer sodium bicarbonate D. Decrease supplementary oxygen