Consider the Following Reaction at Equilibrium

Consider the following reaction at equilibrium. What effect will adding 1 mole of Ar to the reaction mixture have on the system? 2H₂S(g) + 3O₂(g) ⇌ 2H₂O(g) + 2SO₂(g)

A) The reaction will shift in the direction of products.
B) No effect will be observed.
C) The reaction will shift in the direction of reactants.
D) The equilibrium constant will decrease.
E) The equilibrium constant will increase.