Which one of the following given below concerning properties of solutions, describe a colligative effect ?

Options

A. Boiling point of pure water decreases by the addition of ethanol
B. Vapour pressure of pure water decreases by the addition of nitric acid
C. Vapour pressure of benzene changes by the addition of naphthalene
D. Boiling point of benzene does not change by the addition of toluene

Explanation

Ethanol (B.P. is `78.37^(@)C`) and Nitric acid (B.P. is `83^(@)C`) are more volatile than water.
Colligative properties depend solely on the number of particles of the solute and not on the nature of solute and solvent