You received a call from your neighbor,

(A). A history consistent with foreign-body aspiration is considered diagnostic. Any child in the proper setting with the sudden onset of choking, stridor, or wheezing has foreign body aspiration until proven otherwise. The choice A is the best answer as the child start to show signs of respiratory distress with borderline 02 sat. The choice B is the next appropriate action while encourage coughing may be appropriate at home when no respiratory distress is there.