What is the bond order of the $O_2$ molecule?

The $H.O.M.O.$ (Highest Occupied Molecular Orbital) of the $CO$ molecule is:

The correct pair of species with $(A)$ the highest bond order and $(B)$ diamagnetic character is

Answer the following questions:
$(i)$ Give the molecular orbitals and their types formed by $LCAO$ from $2s, 2p_{x}, 2p_{y}$ and $2p_{z}$ atomic orbitals.
$(ii)$ Provide the energy order of molecular orbitals for $Li_{2}, Be_{2}, C_{2}, N_{2}, O_{2}$ and $F_{2}$.

The molecular orbital configuration of a diatomic molecule is
$\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2 \sigma 2p_x^2 \pi 2p_y^2 \pi 2p_z^2$
Its bond order is

Identify the correct increasing order of energies of molecular orbitals for the $F_2$ molecule.