What should you do if you encounter a school bus with its stop sign extended?

Answer: B — Stop until the bus retracts its stop sign

When you encounter a school bus with its stop sign extended, the appropriate action is to stop until the bus retracts its stop sign. This is crucial for the safety of children who may be getting on or off the bus. The extended stop sign indicates that children are present and crossing the roadway, and stopping allows them the necessary time to do so safely without the risk of being struck by a vehicle. It is a legal requirement in most states to stop for school buses when their stop sign is extended, as driving past the bus could result in severe penalties and endanger children's lives. Additionally, other choices do not ensure the safety of children. Passing the bus at low speed could still pose a danger to those who may unexpectedly cross the street. Honking your horn would not be effective in this context and could startle children or other drivers. Speeding past the bus is both illegal and highly reckless, as it puts children in danger. Therefore, stopping until the stop sign retracts is the best practice in this scenario.