Which type of respiratory condition is always considered an emergency?

A. Laryngitis is typically self-limiting and does not require emergency intervention. B. Laryngotracheobronchitis (croup) can cause significant respiratory distress but is usually managed with supportive care unless severe. C. Epiglottitis is a life-threatening condition that causes airway obstruction and requires immediate emergency intervention, including securing the airway and starting antibiotics. D. Spasmodic croup can be distressing but generally resolves with supportive measures and is not an immediate emergency.