$MnO_4^-$ is a good oxidising agent in different medium changing to <br> $MnO_4^- \to Mn^{2+}$ <br> $\; \; \; \; \; \; \; \;\; \; \to MnO_4^{2-}$ <br> $\; \; \; \; \; \;\; \; \; \to MnO_2$ <br> $\; \; \; \; \; \; \; \; \;\to Mn_2O_3$ <br> Changes in oxidation number respectively are :

Question

( A ) $2, 6, 4, 3$
( B ) $5, 1, 3, 4$
( C ) $5, 4, 3, 2$
( D ) $1, 3, 4, 5$