Molecular consists of multiple atomic orbitals

When two atoms combine, the overlap of their atomic orbitals produces molecular orbitals. An atomic orbital belongs to a particular atom, whereas a molecular orbital belongs to a molecule as a whole. Much like an atomic orbital, two electrons are required to fill a molecular orbital. A bonding orbital is a molecular orbital occupied by the two electrons of a covalent bond

according to MOT each energy level can be occupied by 2 electrons which must have opposite spins these pairs of electrons considered to occupy molecular orbital. so molecular orbital is formed from the overlap of the atomic orbitals of the atoms making up the bond.

A delocalised molecular orbital is one that extends across more than 2 atomic centres.

The answer is bonding orbital.