The Tragedy of Macbeth is a play that shows the destruction led by evil deeds. The dagger Macbeth sees in the play is an illusion as it is a false creation. Thus, option D is correct.
An illusion is a misinterpreted perception of things that look deceptive and an imitation of other things. It occurs in the state where the person is anxious and feels guilty about something. Here in the play, Macbeth was hallucinating about the dagger.
In scene I of act II, Macbeth has a false perception of the dagger as it is in his mind because of his guilty conscience. He sees a dagger full of blood in the air pointing at Duncan which makes him question his sanity and creates confusion.
Therefore, option D. the proceeding from the brain is the line that shows the illusion as it leads to a false creation.
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