In which of the following reactions does H2O2 act as a reducing reagent? A) H2O2 + 2I- + 2H+ → I2 + 2H2O B) H2O2 + 2[Co(NH3)6]2+ → 2[Co(NH3)63+ + 2OH- C) 5H2O2 + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5O2 D) 3H2O2 + 2[Cr(OH)6]3- → 2CrO42- + 8H2O + 2OH-

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