Explanation:

Viscosity is the property of a fluid that offers resistance to flow. It is an internal frictional force that opposes the motion of one layer of fluid over another layer. Viscosity is directly proportional to the velocity gradient of the fluid. The higher the velocity gradient, the higher will be the viscosity of the fluid.

When a liquid is disturbed by stirring, it creates a velocity gradient in the fluid. The velocity of the fluid near the surface of the container is different from the velocity of the fluid near the stirrer. This velocity difference creates a shear force in the fluid. The shear force is the force that acts tangentially to the surface of the fluid and is responsible for the deformation of the fluid.

The shear force is directly proportional to the velocity gradient and the viscosity of the fluid. When the shear force is greater than the internal cohesive forces of the fluid, the fluid starts to flow. However, as the fluid starts to flow, the velocity gradient decreases, and the viscosity of the fluid increases. This increase in viscosity creates an opposing force to the shear force, and the fluid comes to rest.

Hence, the liquid disturbed by stirring comes to rest due to its viscosity, which opposes the shear force created by stirring.

Conclusion:

The correct answer is option C, viscosity.