Which one of the following reactions is not an example of a redox reaction?
- A$Cl_2 + 2H_2O + SO_2 \to 4H^{+} + SO_4^{2-} + 2Cl^{-}$
- B$Cu^{2+} + Zn \to Zn^{2+} + Cu$
- C$2H_2 + O_2 \to 2H_2O$
- D$HCl + H_2O \to H_3O^{+} + Cl^{-}$
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