When approaching a railroad crossing:

Answer: B — Slow down, look both ways, and proceed

When approaching a railroad crossing, it is important to slow down, look both ways, and proceed with caution. This is because trains can appear suddenly and it is necessary to have enough time to come to a complete stop if necessary. Increasing speed to cross quickly (option A) is dangerous and increases the likelihood of a collision. Moving to the center of the crossing (option C) is also not recommended as it can block the intersection and trap your vehicle if the crossing gates close. Finally, stopping and putting your vehicle in park (option D) is excessive and unnecessary, as long as you are able to proceed safely after checking for any oncoming trains.