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(D) According to the Arrhenius equation,$k = A e^{-E_a / RT}$.Here,$k$ is the rate constant,$A$ is the frequency factor,$E_a$ is the activation energy

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(D) According to the Arrhenius equation,$k = A e^{-E_a / RT}$.Here,$k$ is the rate constant,$A$ is the frequency factor,$E_a$ is the activation energy,$R$ is the gas constant,and $T$ is the temperature.As the activation energy $(E_a)$ decreases,the value of the exponent $-E_a / RT$ becomes less negative (closer to zero).Consequently,the value of $e^{-E_a / RT}$ increases,leading to a larger rate constant $(k)$.$A$ larger rate constant indicates a faster reaction rate.Therefore,reactions with low activation energy are generally fast.

$A$ reaction with low activation energy is always...............

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