In which of the following reactions does $H_2O_2$ act as a reducing agent?
- A$2FeCl_2 + 2HCl + H_2O_2 \to 2FeCl_3 + 2H_2O$
- B$Cl_2 + H_2O_2 \to 2HCl + O_2$
- C$2HI + H_2O_2 \to 2H_2O + I_2$
- D$H_2SO_3 + H_2O_2 \to H_2SO_4 + H_2O$
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