Concept:Surface tension of a liquid is the force that acts on its surface and it depends on temperature.Explanation:When temperature increases, the kinetic energy of the liquid molecules also increases.This makes the molecules move more rapidly and weakens the intermolecular forces at the surface.As a result, the liquid's surface film becomes weaker and its surface tension decreases.Thus, surface tension is inversely related to temperature, meaning it reduces as temperature rises.Answer:B. decreases.