The diagram represents the Maxwell‒Boltzmann energy distribution curve of the reactants for a chemical reaction with different activation energies, \({E_{{\text{a1}}}}\) and \({E_{{\text{a2}}}}\).

What is the reason why the rate of the reaction with activation energy \({E_{{\text{a2}}}}\) is greater?

A.     More frequent collisions between the particles occur.

B.     More energetic collisions between the particles occur.

C.     A catalyst has been added.

D.     The temperature is higher.

C

The initial wording of the question was thought to be complicated, though it was clear that a catalyst had been added (only possible answer here).