Which of the following is a prohibited action regarding towing a vehicle?

Answer: B — Pushing a disabled bus with riders on board

Pushing a disabled bus with riders on board is prohibited because it presents significant safety risks to both the passengers and the driver. When a bus is being towed, the passengers inside are at an increased risk of injury due to sudden movements or collisions that could occur during the towing process. Towing a bus while it is occupied complicates the situation, as the vehicle may not have the necessary control or stability, especially if it is being pushed rather than towed adequately behind another vehicle. Ensuring passenger safety is a top priority in all transportation regulations, which is why this action is explicitly discouraged in towing guidelines. In contrast, using hazard lights when towing, employing heavy-duty straps designed for towing, and informing passengers about towing procedures are all actions that are generally acceptable and contribute to safety and preparedness during such events.