Final Answer:
A metallic bond is best described as the attraction between positive ions and surrounding electrons (Option A).
Step-by-step explanation:
A metallic bond occurs in metals, where metal atoms donate their outer electrons to form a "sea of electrons" that are delocalized and move freely throughout the structure. The positive metal ions are held together by the electrostatic attraction between these positive ions and the surrounding cloud of delocalized electrons. This cohesive force imparts unique properties to metals, such as high conductivity, malleability, and ductility. Option A accurately represents the essence of a metallic bond, emphasizing the electrostatic attraction between positive metal ions and the shared electrons.
Option A is the answer.