In the Arrhenius equation, $\mathrm{k}={\mathrm{Ae}}^{-{\mathrm{E}}_{\mathrm{a}}/\mathrm{RT}}$ the factor ${\mathrm{e}}^{-{\mathrm{E}}_{\mathrm{a}}/\mathrm{RT}}$corresponds to the

fraction of molecules that have kinetic energy = E_a

fraction of molecules that have kinetic energy < E_a

None of the above

fraction of molecules that have kinetic energy > E_a