When you hear a fire engine siren behind you, what must you do?

Answer: C — Pull over to the side of the road and stop

When you hear a fire engine siren behind you, the appropriate action is to pull over to the side of the road and stop. This is crucial for ensuring emergency vehicles can respond quickly to incidents, as they often need to navigate through traffic at high speeds. By moving out of the way, you are allowing them a clear path, which can be vital in emergency situations where every second counts. Stopping ensures that you are not in the way of the emergency vehicle's intended route, promoting safety for both yourself and the responders. Slowing down, driving with flashers, or speeding up to exit could all lead to confusion or create dangerous situations. For instance, slowing down may not provide enough clearance, and using flashers could mislead other drivers about your intentions. Speeding up may cause you to lose control or create an obstacle, further complicating the situation for emergency responders. Thus, pulling over and stopping is the safest and most effective response.