Sulfur Dioxide Gas Reacts with Oxygen Gas to Form Sulfur

Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.What would the products of the reaction be, if the reactants are those shown in the figure?

A) 2 molecules of sulfur trioxide, and 2 molecules of sulfur dioxide
B) 4 molecules of sulfur trioxide, and 1 molecule of oxygen
C) 3 molecules of sulfur trioxide, and 1 molecule of oxygen
D) 3 molecules of sulfur trioxide, and 1 molecule of sulfur dioxide
E) 4 molecules of sulfur trioxide