Which measure would be most effective in aiding bronchodilation in a child with laryngotracheobronchitis (Croup)?

A. Racemic epinephrine nebulizer therapy is effective in reducing airway inflammation and aiding bronchodilation in croup. B. While oral fluids are important for overall hydration, they do not directly address the bronchodilation needed for croup. C. Long, slow breaths can be helpful but are not as directly effective as nebulized medications in managing croup symptoms. D. Oral analgesics address pain but do not contribute to bronchodilation.