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Multiple Choice Question Based on Passage
Stoke' s Law : A body falling through a viscous medium experiences a retarding force resulting in absorption of energy by the medium in the form of heat. The motion of the body produces a relative motion between the different layers of the fluid. Consequently, it experiences a force which tends to retard its motion. When a small spherical body is dropped in a viscous liquid such as glycerine, it accelerates first, but soon begins to experience a retarding force. When the retarding force becomes equal to the effective weight of the body in the fluid, the body experiences no net force and falls with a constant velocity known as the terminal velocity.
George Stokes found that a small spherical body of radius r moving with a uniform velocity v in a fluid of coefficient of viscosity

experiences a retarding force F given by

F = 6

If the upthrust on a body is negligible compared to its weight, the terminal velocity of a small spherical body falling through a viscous liquid depends upon
(a) the mass of the body
(b) the diameter of the body
(c) the viscosity of the liquid
(d) the acceleration due to gravity