If D1 and D2 are depths of water upstream and down stream of a hydraulic jump, the loss of head at the jump, is

• A. <img src="/_files/images/civil-engineering/irrigation/20-15-93-1.png">
• B. <img src="/_files/images/civil-engineering/irrigation/20-15-93-2.png">
• C. <img src="/_files/images/civil-engineering/irrigation/20-15-93-3.png">
• D. <img src="/_files/images/civil-engineering/irrigation/20-15-93-4.png">