In prologues, there's usually an establishment of a certain POV, and there's foreshadowing. Additionally, it gives some background information above the main character and sets the tone for the rest of the story.
Therefore, the answer is B.
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MacBeth attempts to resolve his conflict by doing the act again. He is consumed by guilt and anger from killing the king that he ends up killing another. This only makes him worse and throws him into the path of evil and tyranny.<span />