Correct Answer - B
Compounds or ions or elements which are strongly attracted towards magnetic field are ferromagnetic (maximum paramagnetic) upaired electrons in valence sheel more the number of unpaired electrons more tha paramagnetic character i.e., ferromagnetic character.
According to MOT dioxygen `(O_(2))` contain one unpaired electron. Hence it is paramagnetic. Chromium (IV) oxide `(CuO_(2))` contain two unpaired electrons in d-orbitals. Hence it is ferromagnetic i.e. maximum paramagnetic. Dihydrogen monoxide `(H_(2)O)`: it is diamagnetic Benzene `(C_(6)H_(6))`: It is diamagnetic
