Client with end stage renal failure.

The nurse is caring for a client with end stage renal failure. PaO2 is 94 mm hg,Arterial blood gases indicate that she is experiencing metabolic acidosis with partial respiratory compensation. Which of the following arterial blood gases support this?

a. PH=7.37, PaCO2=33mm hg, HCO3=18 mEq/L

b. PH=7.33,PaCO2=31mm hg, HCO3=19 mEq/L

c. PH=7.47, PaCO2=50mm hg, HCO3=30 mEq/L

d. PH=7.32, PaCO2=48mm hg, HCO3=18 mEq/L