Pick out the incorrect statement:

• A
  $MnO_4^{2-}$ is quite strongly oxidizing and stable only in very strong alkalies. In dilute alkali,neutral solutions,it disproportionates.
• B
  In acidic solutions,$MnO_4^-$ is reduced to $Mn^{2+}$ and thus,$KMnO_4$ is widely used as an oxidizing agent.
• C
  $KMnO_4$ does not act as an oxidizing agent in an alkaline medium.
• D
  $KMnO_4$ is manufactured by the fusion of pyrolusite ore with $KOH$ in the presence of air or $KNO_3$,followed by electrolytic oxidation in an alkaline solution.