Which of the following equations is a balanced one?
- A$5BiO_3^- + 22H^+ + Mn^{2+} \to 5Bi^{3+} + 7H_2O + MnO_4^-$
- B$5BiO_3^- + 14H^+ + 2Mn^{2+} \to 5Bi^{3+} + 7H_2O + 2MnO_4^-$
- C$2BiO_3^- + 4H^+ + Mn^{2+} \to 2Bi^{3+} + 2H_2O + MnO_4^-$
- D$6BiO_3^- + 12H^+ + 3Mn^{2+} \to 6Bi^{3+} + 6H_2O + 3MnO_4^-$
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