If H is the depth of water retained by a vertical wall, the height of centre of pressure above the bottom is

• A. <img src="/_files/images/civil-engineering/hydraulics/156-7.203-1.png">
• B. <img src="/_files/images/civil-engineering/hydraulics/156-7.203-2.png">
• C. <img src="/_files/images/civil-engineering/hydraulics/156-7.203-3.png">
• D. <img src="/_files/images/civil-engineering/hydraulics/156-7.203-4.png">