Which of the following is a paramagnetic compound?

According to Molecular Orbital Theory:${\text{N}}_2$ ($14e^{-}$): All electrons are paired. Diamagnetic.${\text{H}}_2$ ($2e^{-}$): Electrons paired in $\sigma 1s$. Diamagnetic.${\text{Li}}_2$ ($6e^{-}$): Electrons paired in $\sigma 2s$. Diamagnetic.${\text{O}}_2$ ($16e^{-}$): Has two unpaired electrons in the ${\pi }^{\ast }2p_x$ and ${\pi }^{\ast }2p_y$ antibonding orbitals. This makes it paramagnetic.