Which of the following indicates that fluid resuscitation may be inadequate?

Rationale: A. Urine output of 10 mL/h is correct because oliguria (urine output < 0.5 mL/kg/h or roughly < 30 mL/h in adults) is a key indicator of inadequate perfusion and insufficient fluid resuscitation. In burn or shock patients, adequate fluid resuscitation is essential to maintain renal perfusion and prevent acute kidney injury. A urine output of 10 mL/h suggests hypoperfusion and ongoing intravascular volume deficit. B. Urine output of 50 mL/h is incorrect because this indicates adequate renal perfusion and suggests that fluid resuscitation is likely sufficient. This meets or exceeds the target urine output for most critically ill patients. C. Respiratory rate of 16 is incorrect because this is within normal limits (12–20 breaths/min) and does not indicate hypovolemia or inadequate fluid resuscitation. D. Blood pressure of 120/80 mmHg is incorrect because this is a normal blood pressure. While hypotension can be a late sign of inadequate fluid resuscitation, a normal BP does not necessarily indicate inadequate resuscitation on its own, especially in early shock where compensatory mechanisms maintain BP.