Which statement best differentiates ionic, covalent, and metallic bonds?

Which statement best differentiates ionic, covalent, and metallic bonds?

• A. All three types involve a complete transfer of electrons.
• B. Covalent bonds involve electron transfer between metals and nonmetals.
• C. Ionic bonds involve sharing electrons between nonmetals.
• D. Metallic bonds involve a lattice of positive ions in a sea of delocalized electrons.

Answer: (D)