The health care provider has prescribed spironolactone to be given in addition to hydrochlorothiazide to a client with hypertension. Which finding by the nurse indicates that the spironolactone is having the desired effect?

B Potassium level of 4.2 mEq/L (4.2 mmol/L) C Reduction in dizziness D Sodium level of 138 mEq/L (138 mmol/L) A Blood glucose of 95 mg/dL (5.3 mmol/L)