Question

The fact that boiling point of a pure solvent is lower than theboiling point of a solution of the same solvent is a directconsequence of the
A) freezing-point depression of the solution.
B) vapor pressure of the solution being higher than the vaporpressure of the pure solvent.
C) vapor pressure of the solution being lower than the vaporpressure of the pure solvent.
D)osmotic pressure of the solvent being higher than the osmoticpressure of the solution.
E) osmotic pressure of the solvent being lower than the osmoticpressure of the solution.

Which letter is it and why?