Time of emptying liquid from a hemispherical vessel through an orifice at its bottom, is

• A. <img src="/_files/images/civil-engineering/hydraulics/151-7.132-1.png">
• B. <img src="/_files/images/civil-engineering/hydraulics/151-7.132-2.png">
• C. <img src="/_files/images/civil-engineering/hydraulics/151-7.132-3.png">
• D. <img src="/_files/images/civil-engineering/hydraulics/151-7.132-4.png">