4.
Why does Macbeth decide to murder Macduff's family?

Explanation:

He is so fearful of losing his crown that he will do anything to protect it. When Macduff was absent from Macbeth's inauguration, Macbeth grew suspicious of him and decided to make a strong point by murdering Macduff's family. The reason for the murder of his wife and children was to clear the bloodline.

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