Which volumes of gases at standard temperature and pressure have the same mass as \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of \({{\text{O}}_{\text{2}}}\)?

I.     \({\text{50 c}}{{\text{m}}^{\text{3}}}\) of \({\text{S}}{{\text{O}}_{\text{2}}}\)

II.     \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of \({\text{C}}{{\text{H}}_{\text{4}}}\)

III.     \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of \({\text{Si}}{{\text{H}}_{\text{4}}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

B