combined/mixed acid base disorder - goodman

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What is the interpretation of a blood gas that shows a pH of 7.10, a PaCO2 of 50 mm Hg, and an [HCO3] of 15 mEq/L?
a. Uncompensated respiratory acidosis
b. Partially compensated respiratory alkalosis
c. Compensated metabolic alkalosis
d. Combined respiratory and metabolic acidosis