A patient is admitted with severe emphysema and a PO₂ of 85.He also has a blood pH of 7.25 and a serum bicarbonate of 40 mEq/liter.Which of the following is the accurate description?

A) Metabolic acidosis and respiratory compensation
B) Metabolic alkalosis with a respiratory compensation
C) Respiratory alkalosis with a renal compensation
D) Respiratory acidosis with a renal compensation