The primary concern in this scenario is the immediate danger posed by the child putting coins in her mouth While other options might address the function of the behavior like attention they do not immediately prevent the risk Option A differential reinforcement of other behavior is a good behaviorchange procedure but does not offer immediate safety Option B timeout has been ineffective and likely provided inadvertent attention thus maintaining the behavior Option C verbal instructions is inappropriate given the childs age diagnosis and limited receptive language and also provides attention Option D which involves hiding all available coins antecedent manipulation and response blocking directly prevents the dangerous behavior from occurring This is the quickest and most effective way to prevent danger by making the behavior impossible or difficult to engage in thereby avoiding the opportunity for the behavior to be reinforced by attention or other functions and ensuring the childs safety first and foremost This approach directly manipulates the antecedents to prevent the behavior which is often a critical first step for highrisk behaviors