What should you not do when a school bus has its yellow lights flashing?

Answer: B — Pass the bus

Yellow flashing lights warn that the school bus is about to stop, so you should slow down and be prepared to stop. Passing the bus while those lights are flashing is unsafe because children may be getting on or off. So the action to avoid is speeding past the bus; instead, ease off the accelerator, watch for the red lights and stop arm if the bus signals a full stop, and proceed only when it’s clearly safe. The other options describe appropriate responses (slow down or prepare to stop) or are actions that could put students at risk.