Choose the correct answer: Observation on a spherical object falling in a liquid pool is the method of measuring viscosity by making use of Stokes’ viscosity law. The falling body attains terminal...

Choose the correct answer:

Observation on a spherical object falling in a liquid pool is the method of measuring viscosity by making use of Stokes’ viscosity law. The falling body attains terminal velocity if

(a) the weight of the falling body is more than the sum of the buoyancy force and the drag force

(b) the drag force is equal to the buoyancy force

 (c) the buoyancy force is more than the drag force

 (d) the sum of the buoyancy force and the drag force is equal to the weight of the body.