In which of the following reactions does $H_2O_2$ act as a reducing agent?
- A$H_2O_2 + 2H^+ + 2e^- \rightarrow 2H_2O$
- B$H_2O_2 + 2H^+ + 2e^- \rightarrow 2H_2O$ (Note: This is an oxidizing reaction)
- C$H_2O_2 + 2e^- \rightarrow 2OH^-$
- D$H_2O_2 + 2OH^- \rightarrow O_2 + 2H_2O + 2e^-$
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