What does it mean that valence electrons in a metal are delocalized?

AThe valence electrons move between atoms in shared orbitals.

b.The valence electrons move from outer orbitals to inner orbitals of each atom.

c.The valence electrons move from inner orbitals to outer orbitals of each atom.

DThe valence electrons move out of the orbitals and go into the air.

Verified Answer :

The correct answer is A,  the valence electrons move between atoms in shared orbitals. The result of millions of metal atoms crowding together so that molecular
orbitals become combined most likely is the formation of localized valence
electrons where the electrons are called the "electron sea". This is
a characteristic of compounds that are held together by metallic bonding.

The correct answer is A