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Rate constant of reaction can be expressed by Arrhenius equation as,

$K=A{e}^{-{E}_{a}}{RT}}$

In this equation, E represents:

(a) the energy above which all the colliding molecules will react

(b) the energy below which colliding molecules will not react

(c) the total energy of the reacting molecules at a temperature, T

(d) the fraction of molecules with energy greater than the activation energy of the reaction