Once your school bus is stopped at a railway crossing, you must...?

Answer: C — Open the door to listen for approaching trains

When a school bus is stopped at a railway crossing, the correct action is to open the door to listen for approaching trains. This action is important for safety reasons. By opening the door, the driver can utilize auditory cues to detect if a train is coming, which might not be visible due to obstructions or distance. Listening can provide an additional layer of awareness that visual checks alone may not fully ensure. This practice emphasizes the priority of safety for the passengers on the bus. It’s vital to confirm that the tracks are clear before proceeding, as trains can approach quickly and quietly. While visual checks are also necessary, they may not always suffice, especially in situations where visibility is compromised. Listening for the sound of an oncoming train is a crucial step in ensuring the safety of everyone on board before crossing the railway.