A nurse is monitoring a client who is receiving spironolactone (Aldactone). Which of the following findings should the nurse report to the provider?

A. A blood potassium level of 3.9 mEq/L is normal and does not require intervention. B. Urine output of 500 mL in 5 hours is not concerning and is within the expected range. C. A blood potassium level of 8 mEq/L is dangerously high, indicating hyperkalemia, which can lead to life-threatening arrhythmias. D. Urine output of 200 mL in 4 hours could be a concern for dehydration or renal issues, but it is not directly related to spironolactone use.