Consider the Reaction If the Pressure Is Decreased on an Equilibrium

Consider the reaction If the pressure is decreased on an equilibrium mixture of these three substances, equilibrium will ____, because ____.

A) shift to the right; lower pressure favors fewer moles of gas
B) shift to the right; lower pressure favors more moles of gas
C) shift to the left; lower pressure favors fewer moles of gas
D) shift to the left; lower pressure favors more moles of gas
E) be unchanged; solid NH₄Cl does not appear in the equilibrium constant expression.