(A) :Ethylene glycol is added to water and used as antifreeze in the radiators of automobiles.
(R) :Addition of ethylene glycol lowers the freezing point of water.

When a solute is added, the vapour pressure of pure water will decrease. Raoult's law states that the mole fraction in a component is directly proportional to that component's partial vapour pressure. The freezing point of the solvent is lowered when a non-volatile solute is introduced because the solvent's vapour pressure drops and approaches that of a solid solvent at a lower temperature. On the other hand, adding ethylene glycol to water dramatically raises the boiling point. Glycol and water are used as antifreeze in car radiators because the addition of glycol lowers the freezing point of the water in the radiator, preventing the lines from being burst by the chilly winter temperatures.
Hence, correct option is: (A)   Both (A) and (R) are true and (R) is the correct explanation of (A)