If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is

• A.
• B. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-1.png">
• C. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-2.png">
• D. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-3.png">
• E. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-4.png">