What arterial blood gas result is expected when a person experiences prolonged nasogastric suctioning?

pH 7.50, PaCO2 44 mm Hg, HCO3 28 mEq/L

pH 7.34, PaCO2 45 mm Hg, HCO3 21 mEq/L

pH 7.32, PaCO2 49 mm Hg, HCO3 26 mEq/L

pH 7.46, PaCO2 29 mm Hg, HCO3 25 mEq/L