Consider the Following Reaction at Equilibrium

Consider the following reaction at equilibrium. What effect will reducing the volume of the reaction mixture have on the system? CuS(s) + O₂(g) ⇌ Cu(s) + SO₂(g)

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