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# If a reaction is catalyzed by $x$, then $x$

$\begin{array}{1 1}(a)\;\text{Decreases the rate constant of a reaction}\\(b)\;\text{Doesn't affect equation constant of reaction}\\(c)\;\text{Decreases the enthalpy of reaction}\\(d)\;\text{Decreases the activation energy}\end{array}$

Decreases the activation energy
Hence (d) is the correct answer.