ANS:C - adhesion

Molecules of fluids get attracted due to cohesion. Cohesion is the attractive force between molecules of the same substance. In the case of fluids, such as liquids, cohesion refers to the attraction between molecules of the same liquid. This cohesive force tends to pull the molecules together, creating surface tension and allowing the liquid to form droplets or maintain a certain shape. While capillarity action, surface tension, adhesion, and cohesion are related phenomena, they represent different aspects of intermolecular forces:

1. Capillarity action refers to the ability of a liquid to flow in narrow spaces or tubes, often observed in capillary tubes or porous materials, due to the combined effects of adhesion and cohesion.
2. Surface tension is the cohesive force exerted by molecules at the surface of a liquid, causing the surface to behave like a stretched membrane. Surface tension is a result of cohesive forces between molecules and is responsible for phenomena such as the formation of droplets and the buoyancy of floating objects.
3. Adhesion is the attraction between molecules of different substances. It is the force that allows a liquid to adhere to a solid surface, such as water adhering to the walls of a glass.
4. Cohesion, as mentioned earlier, is the attraction between molecules of the same substance. In fluids, cohesion is responsible for the tendency of liquid molecules to stick together and maintain a certain shape.