A large value of k means that the equilibrium concentrations of products are large compared to the equilibrium concentrations of the reactants." Option C
A high value of k in chemical equilibrium indicates a strong tendency for the reaction to favor product formation since the equilibrium concentrations of the products are substantially higher than those of the reactants. On the other hand, a lower k indicates a less favorable shift toward products rather than necessarily decreased reactant concentrations.
There is no connection between k and the assertion regarding the reaction quotient (q) and the magnitude of equilibrium concentrations. Predicting the predominate direction of chemical reactions at equilibrium based on concentration ratios is made easier with a firm understanding of k values.