When electrons are restricted to a particular region of a molecule, they are said to be localized, whereas when electrons are not confined to a single region but are instead spread out over a larger region of the molecule, they are said to be delocalized. With this knowledge, let us analyze the given electron pairs and see whether they are localized or delocalized.1) The pair of electrons in A are localized because they are part of a double bond between two carbon atoms, and the π-bonding electrons are confined to the vicinity of the double bond.2) The pair of electrons in B are localized because they are part of a lone pair on a nitrogen atom, and they are not shared with any other atom.3) The pair of electrons in C are delocalized because they are part of a conjugated system of double bonds, where the π-electrons are not localized to any one bond but are rather spread out over all of the double bonds. Therefore, the correct answers are:1) A --> Localized2) B --> Localized3) C --> Delocalized