Which of the following statements is/are wrong ?

Options

A. `Ti^(4+)` and `Ag^+` are repelled by magnetic field.
B. `Mn^(2+)` shows maximum magnetic character among the first transition series.
C. `Fe^(2+)` is more stable than `Mn^(2+)` towards oxidation to +3 state.
D. Cr in `Cr_2O_7^(2-)` ion involves `sp^3d^3` hybridisation.