Which of the Following Regarding the Energy of Particles in a Sample

Which of the following regarding the energy of particles in a sample of matter is false?

A) The average kinetic energy of gas-phase particles is directly proportional to their absolute temperature.
B) Gas-phase molecules have multiple forms of kinetic and potential energy.
C) The atomic or molecular composition of a material affects the amount of energy required to change the kinetic energy of its constituent particles.
D) The speed at which particles move is directly proportional to their molar mass.
E) Molecular vibrations contribute both kinetic and potential energy to gas-phase molecules.