Which of the following statement is false?
A. Of the `d^(4)` species, manganese (III) is strongly reducing while `Cr^(2+)` is strongly oxidising.
B. Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
C. The `d^(1)` configuration is very unstable in ions.
D. None of these.
