Of the Reactions Given Below, the Reaction Whose Equilibrium Composition $\rightarrow$

Of the reactions given below, the reaction whose equilibrium composition at a specified temperature is not affected by pressure is

A) S + O₂ $\rightarrow$ SO₂
B) CO + ½O₂ $\rightarrow$ CO₂
C) H₂ + O₂ $\rightarrow$ 2HO
D) H₂ $\rightarrow$ 2H
E) all of the above.