Which statement describes the electron sea model for metallic bonding?

-this model involves electrons held tightly between atoms.
-this model explains all properties of metals.
-this model involves electrons moving among bands of orbitals.
-this model is the simplest model.

This model is the simplest model.

(This is the answer just took the test)

i belive it is water

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.