Some equations for reactions of hydrogen peroxide are shown. (1) $2\text{Fe}^{2+} + \text{H}_2\text{O}_2 + 2\text{H}^+ \rightarrow 2\text{Fe}^{3+} + 2\text{H}_2\text{O}$. (2) $2\text{MnO}_4^- + 5\text{H}_2\text{O}_2 + 6\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 8\text{H}_2\text{O} + 5\text{O}_2$. (3) $2\text{Fe}^{3+} + \text{H}_2\text{O}_2 + 2\text{OH}^- \rightarrow 2\text{Fe}^{2+} + \text{O}_2 + 2\text{H}_2\text{O}$. In which reaction is hydrogen peroxide acting as a reducing agent?
- A1 and 3
- B1 only
- C2 and 3
- D2 only