If your bus is disabled, when may it be towed or pushed to discharge passengers?

Answer: C — If getting off the bus sooner would be unsafe

The correct choice emphasizes the safety of passengers during a bus emergency situation. When a bus is disabled, it is crucial to prioritize the safety of those aboard. If discharging passengers could potentially put them in harm's way—due to traffic conditions, the location of the bus, or external environmental factors—then it’s vital to keep them on the bus until it's safe to move. This approach ensures that passengers are not exposed to dangers such as oncoming traffic or hazardous conditions outside of the bus. Other considerations, such as the presence of a mechanic, the speed of towing, or the bus being in the way, while important, do not prioritize the immediate safety of passengers as effectively. The focus should always remain on ensuring a safe environment for discharging passengers, making the correct answer particularly fitting in handling such scenarios.