When KMnO4 acts as an oxidising agent and ultimately forms [MnO₄]²⁻, MnO₂, Mn₂O₃, Mn²⁺, then the number of electrons transferred in each case respectively is:

A. 4, 3, 1, 5
B. 1, 5, 3, 7
C. 1, 3, 4, 5
D. 3, 5, 7, 1