Final answer:
Since passing a stopped school bus is subject to local traffic laws and varies by state or region, and the question does not specify which set of regulations to apply, it is recommended to check with local authorities for the correct speed, if any, allowed in that situation.
Step-by-step explanation:
When a school bus has stopped directly in front of a school to drop off or pick up children, traffic laws for passing the bus can vary by state or region. Typically, it's required that you stop and cannot pass the bus when its stop sign is extended and lights are flashing. However, if the question implies a specific allowed speed under certain conditions, the provided options must be reviewed in the context of the local traffic regulations. Since the question did not provide specific local regulations, and without knowing the specific region to reference the appropriate law, it is not possible to determine the correct speed. The safest legal and professional response would be to consult the local traffic laws or the state's Department of Transportation for the most accurate information.