The correct answer is option B "banquo is killed but his son, fleance, escapes". In William Shakespeare's classical play "Macbeth", one of the earliest events that glance the over ambition of Macbeth, was him killing Banquo. Fortunately, Banquo's son Fleance could escape from Macbeth. However, the one that took revenge from all the killing that Macbeth was responsible of was Macduff, which happened by the end of the play.