What is the difference in the $MO$ energy level diagram for diatomic molecules from $Li_2$ to $N_2$ compared to those from $O_2$ to $Ne_2$?

• A
  The energy of $\sigma_{2p_z}$ is higher in $Li_2$ to $N_2$ than in $O_2$ to $Ne_2$.
• B
  The energy of $\sigma_{2p_z}$ is lower in $Li_2$ to $N_2$ than in $O_2$ to $Ne_2$.
• C
  There is no difference in the energy levels.
• D
  The $\pi_{2p_x}$ and $\pi_{2p_y}$ orbitals are higher in energy for $Li_2$ to $N_2$.