Option 1: confession -> an admission of guilt, but not a legal judgment.
Option 2: conviction -> a formal declaration that someone is guilty of a crime.
Option 3: consent -> permission or agreement, unrelated to legal verdicts.
Option 4: concord -> harmony or agreement between people, not a legal term.
Hence, Option 2: conviction -> Acquittal means a judgment declaring someone not guilty, while conviction is a judgment declaring someone guilty - making them perfect antonyms in legal context -> correct