Output of a bulldozer is (i) Increased if drawbar HP of the tractor is increased for a given hauling distance (ii) Decreased if drawbar HP of the tractor is increased for a given hauling distance (iii) Increased if the hauling distance is increased for a given drawbar HP of the tractor (iv) Decreased if the hauling distance is increased for a given drawbar HP of the tractor?

• A. (i) and (iii) are correct
• B. (i) and (iv) are correct
• C. (ii) and (iii) are correct
• D. (ii) and (iv) are correct