Option D) is the correct option. The role of the catalyst is to provide a new pathway for the reaction to take place which has lower activation energy.
The function of the catalyst is to change the rate of reaction without interfering with the reaction itself or without getting consumed in the reaction itself.
Catalyst only affects the activation energy of the reaction and does not change the enthalpy difference of the reaction. In other words, the final and initial energy of the product and reactant respectively remains the same even in presence of the catalyst.
In options C) and B) the final and initial energy of the reaction is different for both pathways, hence these are incorrect.
In option A) the activation energy of the uncatalyzed reaction is less than the catalyzed one which is not possible.
Therefore Option D) is the correct reaction pathway showing the effect of catalyst on an uncatalyzed reaction.
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