A nurse is caring for a toddler who has acute laryngotracheobronchitis and has been placed in a cool mist tent. Which of the following findings indicates that the treatment has been effective?

Rationale: A. A cool mist tent helps decrease airway inflammation and laryngeal spasm. A reduction in stridor indicates improved airway patency and effective treatment. B. Improved hydration is a benefit of humidified air but is not the primary indicator of treatment effectiveness for acute laryngotracheobronchitis. C. A barking cough is a classic symptom of laryngotracheobronchitis (croup) and its persistence does not indicate treatment effectiveness. D. A decreased temperature may occur with antipyretics but is not the main goal of mist therapy for airway management.