In which of the following reactions does the oxidation number not change?

  • A
    $SO_2 + 2H_2S \to 2H_2O + 3S$
  • B
    $2Na + O_2 \to Na_2O_2$
  • C
    $Na_2O + H_2SO_4 \to Na_2SO_4 + H_2O$
  • D
    $4KClO_3 \to 3KClO_4 + KCl$

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