If you hear an emergency vehicle siren, what is the appropriate reaction?

Answer: B — Pull over and stop

When you hear the siren of an emergency vehicle, the appropriate and safe response is to pull over and stop. This action allows the emergency vehicle, which could be an ambulance, fire truck, or police car, to pass through traffic quickly and safely as they may be responding to a critical situation. Pulling over helps to clear the path for the emergency responder and ensures that they can reach their destination without delays. Additionally, stopping helps prevent any potential accidents that could occur if drivers were to continue moving or make abrupt maneuvers in the presence of an emergency vehicle. Properly responding to such situations is crucial for public safety and demonstrates responsible driving behavior.