What is the significance of the " show of kings " Macbeth sees after he talks to the three apparitions ?

what is the significance of the " show of kings " macbeth sees after he talks to the three apparitions ? A: the witches reveal that they prefer banquo to rule instead of macbeth : B: shakespear is flattering king kames i by showing the ancestral line of great kings descended from banquo : C : duncan and his sons will haunt macbeth : D: macbeth sees his descendants who will be kigs of england , sotland , and wales