Answer:
C. If lightning strikes the shed, the aluminum's free-floating electrons could easily conduct the electricity throughout the shed.
Step-by-step explanation:
In metals there are many free flowing electrons that are shared by the metallic cation. The valence electrons are delocalized throughout the metal and therefore they can conduct electricity when lightning strikes the shed. Metallic bonds are different than covalent or ionic bonds.
In covalent bonds the electrons are shared between a pair of nonmetals. In ionic bonds electrons lost by the metal atom is gained by the non-metal thus giving rise to electrostatic forces of attraction between them.