Certain metals can kill or inhibit bacteria; this property is known as antibacterial or antimicrobial activity.Explanation:Copper has strong antibacterial properties and can destroy many types of bacteria on contact.This is why copper surfaces are sometimes used in hospitals to reduce infections.Iron, sodium, and aluminium do not show significant antibacterial action in ordinary conditions.Among the listed metals, copper is the only metal widely recognised as antibacterial.Answer:D. Copper