We can actually deduce here that the inclusion of the knocking in the stage directions affect the scene in the following way: D. The repeated knocking means that someone knows about Duncan's death.
Macbeth is known to be a play that was written by William Shakespeare. The play reveals how Macbeth killed the king of Scotland because of what the witches told him.
We see here that option D is correct because the knocking symbolizes that the death of Duncan has been known and danger looms.
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