(A) :When methanol is added to water boiling point of water decreases.
(R) :Methanol when added to water gives a non ideal solution with negative deviation.

Elevation of boiling point refers to the fact that a solution's boiling point is higher than that of a pure solvent because a liquid's boiling point (that of a solvent) rises when a chemical is added to it. This happens when a non-volatile solute like salt is mixed with a pure solvent like water. 

When methanol is added, water loses some of its boiling point. Due to a cooperative property with a higher boiling point, the solvent experiences an increase in vapour pressure when a more volatile solute is introduced
Hence, correct option is: (D) Both (A) and (R) are false