What should a driver do when approaching a railroad crossing?

Answer: B — Look both ways and prepare to stop

When approaching a railroad crossing, it is essential for a driver to look both ways and prepare to stop. This action is crucial because trains can approach quickly and quietly, and their presence may not always be immediately visible. By scanning the area for any oncoming trains and being prepared to stop, the driver ensures their own safety as well as the safety of others. Additionally, many railroad crossings are equipped with warning signs and signals that indicate when a train is nearby. Being vigilant and taking precautions at these crossings helps to prevent accidents. The other options are less safe; for instance, speeding through the crossing disregards the potential danger, while continuing at the same speed fails to account for any approaching trains. Using the horn can indicate a vehicle's presence but does not address the immediate need to check for trains and stop if necessary. Therefore, taking the time to look both ways and be ready to stop is the best practice when dealing with railroad crossings.