the pair of metal ions that can give a spin - only magnetic moment of 3.9 BM for the complex `[M(H_(2) O)_(6)]Cl_(2)`is

Options

A. `V^(2+)and Co^(2+)`
B. `V^(2+)and Fe^(2+)`
C. `Co^(2+)and Fe^(2+)`
D. `Cr^(2+)and Mn^(2+)`