The d-electronic configuration of `Cr^(2+), Mn^(2+), Fe^(2+) and Ni^(2+)` are, `3^(4), 3d^(5), 3d^(6) and 3d^(8)` respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?
A. `[Cr(H_(2)O)_(6)]^(2+)`
B. `[Mn(H_(2)O)_(6)]^(2+)`
C. `[Fe(H_(2)O)_(6)]^(2+)`
D. `[Ni(H_(2)O)_(6)]^(2+)`