Which of the following is a correct explanation of a property of metals that can be explained by the sea of electrons model of metallic bonding?
(a) Metals are shiny because photons of light bounce off the metal surface.
(b) Metals are malleable (can be hammered into sheets) because the sea of electrons fill in the dents when a hammer hits a sheet of metal.
(c) Metals are ductile (can be stretched into wires) because metal atoms form long chains of linear bonds.
(d) Metals can conduct electricity because the valence electrons of metal atoms are free to move around within the metal.
(e) Metal solids have lower melting points than nonmetal solids because the forces of attraction between metal atoms are weaker than the forces of attraction between nonmetal molecules.