Which is a mutual reduction reaction?
A) KMnO₄ + O₃ B) H₂O₂ + O₃
C) Ag₂O + O₃ D) KI + H₂O + O₃

 KMnO₄ + O₃ $\to$no reaction

${\mathrm{H}}_2$$\stackrel{-1}{{\mathrm{O}}_2}$ + ${\mathrm{O}}_3$ $\to$${\mathrm{H}}_2\stackrel{-2}{\mathrm{O}}$+$2{\mathrm{O}}_2$

$\stackrel{+2}{{\mathrm{Ag}}_2}\mathrm{O}$₂ +${\mathrm{O}}_3$  $\to$$2\stackrel{0}{\mathrm{Ag}}$ +$2{\mathrm{O}}_2$

2 KI^-1 (aq) + O₃ (g) + H₂O (l) →2 KOH (aq) + I⁰₂ (s) + O₂ (g)