Consider the Following Reaction at Equilibrium

Consider the following reaction at equilibrium. What effect will adding KCl have on the system? 2KClO₃(s) ⇌ 2KCl(s) + 3O₂(g)

A) No effect will be observed since KCl is a solid and is not included in the equilibrium expression.
B) The equilibrium constant will decrease.
C) The reaction will shift in the direction of reactants.
D) The equilibrium constant will increase.
E) The reaction will shift in the direction of products.