What's the main reason for cleaning your wheels and tyres when you leave a building site? What's the main reason for cleaning your wheels and tyres when you leave a building site?

• Possible answers:

   
• A. To keep the tyres in good condition
• B. To prevent the tyres from damaging the road surface
• C. To reduce air leakage from the tyre valves
• D. To stop mud dropping onto the road