Of the Reactions Given Below, the Reaction Whose Number of Moles

Of the reactions given below, the reaction whose number of moles of products increases by the addition of inert gases into the reaction chamber at constant pressure and temperature is

A) S + O₂ $\rightarrow$ SO₂
B) CO + ½O₂ $\rightarrow$ CO₂
C) H₂ + O₂ $\rightarrow$ 2HO
D) H₂ $\rightarrow$ 2H
E) none of the above.