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According to molecular orbital theory, the paramagnetism of ${O_2}$ molecule is due to presence of
Unpaired electrons in the bonding $\sigma $ molecular orbital
Unpaired electrons in the antibonding $\sigma $ molecular orbital
Unpaired electron in the bonding $\pi $ molecular orbital
Unpaired electrons in the antibonding $\pi $ molecular orbital
Solution
The reason that it is paramagnetic is because the oxygen molecule has two unpaired electrons. Electrons not only go around the atom in their orbitals, they also spin, which creates a magnetic field. The reason that it is paramagnetic is because the oxygen molecule has two unpaired electrons. The last two electrons go into separate, degenerate $\pi$ orbitals, according to Hund's Rule. Thus, oxygen has two unpaired electrons and is paramagnetic
