The fusion of manganese dioxide with $KOH$ in the presence of an oxidizing agent like $KNO_3$ yields a compound. Identify the compound and its color.
- A$K_2MnO_4$,dark green
- B$KMnO_4$,purple
- C$Mn_2O_4$,brown
- D$Mn_2O_4$,black
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