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Content: b) Polonius's death contributes to Ophelia's madness. c) Polonius's death causes Laertes to return to Denmark to get revenge. How does King Claudius's speech relate to the central conflict in Hamlet? Claudius's vow to avenge Polonius's death helps move the central conflict to its climax. How do plot events affect Ophelia's character development? At the beginning of the play, Ophelia is obedient and proper, but Polonius's death causes her to behave strangely and inappropriately. How does Laertes's character develop between Act I and Act IV of the play? In Act I, Laertes is calm and dutiful; in Act IV, he is vengeful and does not care about rules. Which plot event accounts for the change in Laertes's character in Act IV of Hamlet?