During the production of sulfuric acid, this exothermic reaction takes place: $\text{2SO}_2(g) + \text{O}_2(g) \rightleftharpoons \text{2SO}_3(g)$ Which changes would shift the equilibrium position to the right?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only