Final answer:
The maximum distance you can stop away from a railroad crossing is 50 feet.
Step-by-step explanation:
The maximum distance you can stop away from a railroad crossing depends on various factors, such as road conditions, driver reaction time, and the speed of the vehicle. However, a general guideline is to stop at least 50 feet away from the railroad crossing. This distance allows for a safe stopping distance and provides enough time to react to any oncoming trains. Therefore, the correct answer is b) 50 feet.