The nurse is caring for a patient with Crohn's disease who has diarrhea. Which of the following would alert the nurse that the patient may have a fluid balance disturbance?

A. Observation of 350 ml of amber urine in the patient's Foley catheter over the past hour: This is a very healthy urinary output (well above the 30 mL/hr minimum). While "amber" color can sometimes suggest concentration, the sheer volume indicates the patient is currently well-hydrated and the kidneys are functioning excellently. B. The patient's urine specific gravity is 1.005 (reference range 1.005-1.020): A urine specific gravity at the low end of normal indicates dilute urine, suggesting adequate hydration. This finding does not indicate fluid imbalance and may reflect recent fluid intake or renal compensation. C. The nurse records that the total urinary output during the past 8 hours is 200 ml: Oliguria (<30 ml/hr) over 8 hours indicates significant reduction in renal perfusion, which may reflect dehydration from diarrhea or early hypovolemia. This is a critical marker for fluid imbalance that requires intervention. D. The patient reports drinking 78 ounces of water every day: Adequate daily fluid intake suggests the patient is attempting to maintain hydration. This report alone does not indicate fluid imbalance, though ongoing losses from diarrhea may still place the patient at risk.