If s is the potential infiltration, P is rainfall in cm in a drainage of a soil with fair pasture cover, the direct run off Q in cm is given by

• A. <img src="/_files/images/civil-engineering/water-resources-engineering/175-8.108-1.png">
• B. <img src="/_files/images/civil-engineering/water-resources-engineering/175-8.108-2.png">
• C. <img src="/_files/images/civil-engineering/water-resources-engineering/175-8.108-3.png">
• D. <img src="/_files/images/civil-engineering/water-resources-engineering/175-8.108-4.png">