What event in act iv foreshadows macbeth's eventual downfall? a. macduff calls macbeth a tyrant and asks malcolm to bring an army to scotland to defeat macbeth. b. macduff discovers macbeth has murdered his family and vows to kill macbeth himself. c. lady macduff tells her son that he no longer has a father and refuses to acknowledge macduff. d. malcolm tests macduff's loyalty to him by pretending that his vices would make him a bad king