Answer
Please see the work below.
Work Step by Step
We know that
a. The molecules of A would have the majority of molecules in the gas phase as at this temperature, liquid has the higher fraction of molecules having enough kinetic energy to vaporize.
b. The molecules having strongest intermolecular forces will have the fewest molecules in the gas as a higher kinetic energy is required to overcome the attractions.
c. The molecules having the strongest intermolecular forces will have the lowest vapor pressure.
