All vehicles carrying passengers for hire, all buses carrying passengers and all vehicles carrying explosives or flammable liquids must always stop no closer than and no farther than from railroad tracks. a. 50 feet, 100 feetb. 5 feet, 10 feetc.15 feet, 50 feetd. 25 feet, 50 feet

C.15 feet, 50 feet

Explanation:

In the state of Virginia  all vehicles must stop within 50 feet but not less than 15 feet from the closest rail on a railroad crossing if either indicated to do so or if an approaching train is visible.

Exception of cities or towns, the person driving any motor vehicle conveying passengers for hire, or of any vehicle conveying explosive substances or flammable liquids,  must stop within 50 feet but not less than 15 feet from the closest rail of a railroad.