This answer is not correct. I think that you are confused as to the difference between the equilibrium equation and reaction rates. The rate of a chemical reaction does depend on concentrations but really only depends on the concentrations of the reactants. If the concentrations of either or both of the reactants is increased the probability of collisions will increase and thus so will the rate of the reaction.
This question is really concerned with how a direct proportion must change when one of the values in the proportion is changed. K is a constant which means that it must not be changed. If you increase either the numerator or denominator of a fraction and if that fraction must equal a constant, then the other number must increase in proportion to the number that was changed.