A 4-year-old child presents with barking cough, inspiratory stridor at rest and moderate work of breathing. Temperature is 38.0°C, oxygen saturation 96% on room air. He is alert but distressed. What is the most appropriate initial treatment?AAdminister nebulised adrenaline and oral dexamethasoneBIntubate immediately without medical therapyCGive oral amoxicillin for presumed bacterial tracheitisDGive salbutamol via spacer for presumed asthmaEProvide humidified oxygen only and observeCheck my answer