Colligative properties are those properties of solutions that depend on the number of dissolved particles in solution, but not on their identity. Among the options given, all except Option B (Boiling point) refer directly to colligative properties. Before clarifying why boiling point alone isn't the correct answer, let's defıne each term: Vapour Pressure Lowering (Option A): A colligative property that refers to the decrease in the vapor pressure of a solvent when a non-volatile solute is dissolved in it compared to the vapor pressure of the pure solvent. Freezing Point Depression (Option C): Another colligative property which states that the freezing point of a solvent will be lower when a solute is dissolved in it compared to the freezing point of the pure solvent. Osmotic Pressure (Option D): Also a colligative property, osmotic pressure is the pressure required to stop the flow of solvent molecules through a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.