Identify $(A)$,$(B)$ and $(C)$ in the given reaction sequence:

  • A
    $Mn_2O_3, MnO_2, Mn_2O_7$
  • B
    $MnO_2, K_2MnO_4, KMnO_4$
  • C
    $FeCr_2O_4, K_2Cr_2O_7, KCrO_4$
  • D
    $CuSO_4, Cu_2S, V_2O_5$

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