Sulfur dioxide acts as a preservative during winemaking. The equations below show the reactions that take place when sulfur dioxide dissolves in water. $\text{H}_2\text{O} + \text{SO}_2 \rightleftharpoons \text{HSO}_3^- + \text{H}^+$ $\text{HSO}_3^- + \text{H}^+ \rightleftharpoons \text{SO}_3^{2-} + 2\text{H}^+$ Which statement about these two reactions is true?
- A$\text{HSO}_3^-$ acts as a base.
- B$\text{SO}_2$ acts as an oxidising agent.
- C$\text{SO}_3^{2-}$ acts as an acid.
- D$\text{SO}_3^{2-}$ acts as a reducing agent.