The correct answer is B: When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications. It is permissible to communicate with amateur stations in countries outside areas administered by the FCC when the contact is with amateurs in any country except those whose administrations have notified the ITU that they object. This is the default permission - you can contact amateurs worldwide unless their country has specifically objected. For amateur radio operators, this allows international communications while respecting national sovereignty. Understanding this helps ensure legal international operation.