the answer is C. ....i hope im right
The witches in Act IV of Macbeth show Macbeth various pictures of children, but the image of a procession of kings, all from Banquo's line, with an image or allusion to Macbeth is the one that is most significant in anticipating Macbeth's demise.
Act IV's discovery that Macbeth has killed his family and Macduff's subsequent vow to kill Macbeth are the events that portend Macbeth's final demise. This serves as a warning that Macbeth as well as will soon clash.
Since his previous two prophesies came true, Macbeth trusts each apparition's prophecy that is presented to him. He already understands the first, as Like Macbeth sarcastically remarks: he must watch out for Macduff. The plain floating head, on the other hand, predicts how Macbeth will pass away—by being decapitated.
Therefore, the above explanation shows the downfall of Macbeth.
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