Which of the Following Is the Primary Reason for a Higher

Which of the following is the primary reason for a higher reaction rate at higher temperatures?

A) Molecules move faster at higher temperatures, producing more violent collisions
B) Electrons occupy higher principal energy levels and are therefore more reactive
C) There is a larger fraction of molecules with sufficient energy to react
D) Molecules increase in size with increasing temperature, providing more surface area for potential collisions
E) The higher temperature creates a lower activation energy, so more molecules can pass over the potential energy barrier