If is the depth of water in metres, B is the number of days of base period and D is the duty in hactare/cumec, the relationship which holds good, is

• A. <img src="/_files/images/civil-engineering/irrigation/15-15-26-1.png">
• B. <img src="/_files/images/civil-engineering/irrigation/15-15-26-2.png">
• C. <img src="/_files/images/civil-engineering/irrigation/15-15-26-3.png">
• D. <img src="/_files/images/civil-engineering/irrigation/15-15-26-4.png">
• E. none of these.