A pаtient with а high smаll‑bоwel оbstructiоn has been vomiting persistently for two days. The nurse reviews the patient’s arterial blood gas results: pH 7.52, PaCO₂ 44, HCO₃⁻ 34. Which explanation best describes why this patient has developed this acid–base imbalance? pH- 7.35-7.45 PaCO2- 35-45 mm Hg HCO3- 22-26 mEq/L