What minimum distance should you stop from a railway crossing in a rural area?

Answer: C — 15 metres

Selecting option A or B would not provide enough distance for a safe stop at a railway crossing in a rural area. Option D allows for adequate distance, but the minimum distance required is 15 metres, making option C the correct answer. It is important to remember that railway crossings may have unexpected obstructions or hazards, so giving yourself a bit of extra distance is always a good idea for safety.