Concept:Surface tension is the force that acts on the surface of a liquid due to attraction between its molecules.This force decreases when temperature increases or when impurities like soap or oil are added.Explanation:Cold water has the strongest intermolecular forces among the given liquids.Hot water shows lower surface tension because heating increases molecular motion and weakens cohesion.Soapy water and oily water have reduced surface tension because soap and oil act as impurities that disturb surface bonding.Thus, cold water gives the highest surface tension among the listed liquids.Answer:B. Cold water