Which Statement Regarding the Fractional Distillation of Two Substances Is

Multiple Choice

Which statement regarding the fractional distillation of two substances is not correct?

A) The substance with the lower boiling point has a higher concentration in the vapor than in the liquid.
B) The boiling point of the mixture is not constant, changing as the distillation progresses.
C) The substance with the higher vapor pressure has a higher concentration in the vapor than in the liquid.
D) The mole ratio of the two substances in the vapor is not the same as it is in the liquid.
E) Raoult's law does not apply to mixtures of volatile components.