Which of the following represents an external conflict?. a.. . Before Macbeth kills King Duncan, he imagines he sees a dagger floating in the air in front of him.. b.. . Macbeth regrets killing King Duncan, although he would do it again if necessary.. c.. . Macbeth wants Banquo dead, so he hires men to murder him.. d.. . At the banquet, Macbeth's guilty conscience conjures up an image of the dead Banquo..