Concept:Surface tension is caused by the cohesive forces that exist between molecules of the same liquid.Explanation:Inside a liquid, each molecule is pulled evenly by surrounding identical molecules. At the surface, molecules have fewer neighbors above, creating a net inward pull. This pull reduces the surface area to a minimum, which is surface tension. Cohesive force acts between similar molecules like water–water. Gravitational and electrical forces are not responsible for surface tension. Adhesive force acts between different molecules and does not cause surface tension. Hence, surface tension is a direct result of intermolecular cohesive forces.Answer:D. Cohesive Force between Molecules