A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistance of 30 kg per tonne. If this tractor is operated on a level road having a rolling resistance of 40 kg per tonne, then the drawbar pull of the tractor will$?

• A. Reduce by 200 kg
• B. Increase by 200 kg
• C. Increase by 250 kg
• D. Reduce by 250 kg