Concept:The movement of a liquid in a narrow tube is known as capillary action or capillarity.
Explanation:Capillarity occurs when a liquid rises or falls in a narrow tube due to the combined effect of cohesive and adhesive forces.
If adhesive forces are stronger than cohesive forces, the liquid rises.
If cohesive forces are stronger, the liquid falls.
This effect is clearly seen in narrow tubes and is responsible for phenomena like the rise of water in a thin glass tube.
Osmosis, Brownian motion, and diffusion are different processes and do not describe this movement in a narrow tube.
Answer:C. capillarity