an increase in the activation energy of the forward and reverse reactions
The rate constant $k$ will decrease and the rate of the reaction will decrease.
The rate constant $k$ will increase and the rate of the reaction will increase.
The rate constant $k$ will increase and the rate of the reaction will decrease.
The rate constant $k$ will decrease and the rate of the reaction will increase.
Unable to predict what happens to both the rate constant $k$ and the rate of the reaction.