A nurse is caring for a client who has COPD and the following ABG values: pH 7.30 (7.35 to 7.45), PaO2 75 mmHg (80 to 100 mmHg), PaCO2 52 mmHg (35 to 45 mmHg), HCO₃⁻ 27 mEq/L (21 to 28 mEq/L), SaO₂ 86%
The nurse should identify that these values indicate which of the following acid-base imbalances?
A. Metabolic acidosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis