At first, the young couple didn't realize they were talking to dangerous criminals. Once they realized who they were, they ..... to police. (*) turned them in (*) turned over (*) turned them down (*) turned them up
This is a companion discussion topic for the original entry at https://english.best/questions/8232,at-first-the-young-couple-didnt-realize-they-were-talking-to-dangerous-criminals-once-they-realized-who-they-were-they-___-to-police/