If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T C, according to Stoke's law, is

• A. <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-1.png">
• B. <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-2.png">
• C. <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-3.png">
• D. <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-4.png">
• E. none of these.