The correct option is C H2O2+2Br−+2H+→2H2O+Br2
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Hence option C is correct in which H2O2 is reduced in water where as bromine ion is oxidised to Br2.