According to MOT, two atomic orbitals overlap resulting in the formation of molecular…

According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbitals. Number of atomic orbitals overlapping together is equal to the molecular orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount ∆. This known as the stabilization energy. The energy of antibonding molecular orbital is increased by ∆‘ (destabilisation energy).
Which of the following pairs of molecule can exist ?