What should everyone do when a school bus is stopped with its red lights flashing on a highway with less than four lanes?

Answer: B — Everyone must stop

When a school bus is stopped with its red lights flashing on a highway that has fewer than four lanes, it is crucial for everyone to stop. This rule is in place to ensure the safety of children boarding or exiting the bus. The flashing red lights serve as a signal that children may be crossing the road, and stopping from both directions helps protect these vulnerable pedestrians. All vehicles must come to a complete stop regardless of their position relative to the bus—whether they are behind it or approaching it from the front. This law is enforced to minimize risks and promote a safe environment for students. Therefore, stopping is not just a best practice but a legal requirement in such situations.