`N_2` and `O_2` are converted to mono cations `N_2^+` and `O_2^+` respectively, which statement is wrong ?
A. In `N_2^+`, the N-N bond weakens
B. In `O_2^+`, the O-O bond order increases
C. In `O_2^+`, paramagnetism decreases
D. `N_2^+` becomes diamagnetic.