Answer : Option C) Atomic orbitals overlap to form molecular orbitals in which the valence electrons of the atoms travel.
Explanation : The band theory in the metallic bonding can be explained by the combination of atomic orbitals to form molecular orbitals in which the valence electrons of the different or same atoms travels to form molecular bonding.
It can be bonding or anti-bonding, depending on the availability of the electrons coming from the atoms of elements.