For a reaction at equilibrium, the change can increase the rates of the forward and reverse reactions is the change in the concentration of reactants and products.
Equilibrium state of any chemical reaction is that state where the concentration of reactants and products will remain constant.
Any change in the equilibrium state of the system of any chemical reaction will carry the reaction to the forward and backward side, where the observed change will stabilize. So, given options will not satisfy the increase in the rate of forward & backward reaction. It only possible when the concentration of reactants as well as products increases.
Hence, change in concentration of reactants & products will increase both rates.
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