Metallic solids are composed of planes of individual metal atoms held together by the strong force of attraction between these atoms. Valence electrons are shared by many atoms, delocalizing these electrons over many atoms. Because these valence electrons aren't tightly bound to individual atoms, they are free to migrate through the metal. Describe an application due to this delocalization of electrons within metals. A) Heat resistant metals that can be used in situations where temperatures may exceed 1000 Kelvin. B) Stabilization of pure metals to help with building structure. C) Electrical conductivity in circuit boards. D) Reinforcement of metals by mixing them and creating alloys. ]