Answer:
Macbeth's porter scene functions as a comic relief after King Duncan is killed. The troll-like gatekeeper makes the audience or reader laugh with his drunken banter, and relieves the tension of the killing in the prior scene. He casts light on Macbeth's internal torment.
Explanation:
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B. This description sounds most like a foil. They tend to help the main character evolve to something great and has little change in themselves
