How far must you stop from a railroad track if you are driving a motor vehicle carrying passengers for hire, school bus, motor vehicle carrying material that is corrosive, flammable, explosive, or poisonous, or motor vehicle used for the transportation of flammable or corrosive liquids in bulk, whether loaded or empty?

A) At least 10 feet from the nearest rail
B) At least 15 feet from the nearest rail
C) At least 20 feet from the nearest rail
D) At least 25 feet from the nearest rail