Which of the following statements about furosemide and potassium is true?

A. Furosemide typically causes hypokalemia (low potassium), not hyperkalemia. B. There is no such thing as a potassium allergy; this statement is incorrect. C. Furosemide does not increase potassium levels; it promotes potassium excretion. D. Furosemide is a loop diuretic that increases the excretion of potassium in urine, so patients often require potassium supplementation to prevent hypokalemia.