In which of the following reactions does $H_2O_2$ act as a reducing agent?
- A$PbO_{2(s)} + H_2O_{2(aq)} \to PbO_{(s)} + H_2O_{(l)} + O_{2(g)}$
- B$Na_2SO_{3(aq)} + H_2O_{2(aq)} \to Na_2SO_{4(aq)} + H_2O_{(l)}$
- C$2KI_{(aq)} + H_2O_{2(aq)} \to 2KOH_{(aq)} + I_{2(s)}$
- D$KNO_{2(aq)} + H_2O_{2(aq)} \to KNO_{3(aq)} + H_2O_{(l)}$
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