Correct Answer  Option 1 : 1.13 × 10
^{4} N
CONCEPT:

Viscosity: The state of being sticky, thick, and semifluid inconsistency, due to internal friction of fluids is called viscosity.

Stokes Law: This law tells about the viscous drag force when a sphere goes with a terminal velocity v inside a liquid.
By this law viscous drag force is given by
F = 6πηrv
where r is the radius of the sphere, v is the velocity, and η is the viscosity of the fluid.
CALCULATION:
Given that r = 2 mm = 2 × 10^{3} m; v = 30 mm/s = 30 × 103 m/s; η = 1 Ns/m2
viscous drag force F = 6πηrv
F = 6π × 1 × 2 × 103 × 30 × 103
F = 36π × 106 N
F = 1.13 × 104 N
So the correct answer is option 1.