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The Ghost of King Hamlet appears to his son, Prince Hamlet. The Ghost reveals a terrible secret: he was murdered by his own brother, Claudius (who is now the new King of Denmark and married to Hamlet's mother, Queen Gertrude).
The Ghost's explicit command to Hamlet is to seek revenge for this murder. The Ghost describes the crime, stating, "If thou didst ever thy dear father love... Revenge his foul and most unnatural murder." The Ghost wants Hamlet to restore justice by killing Claudius. While the Ghost instructs Hamlet not to harm his mother, Queen Gertrude, his primary and defining command is the call for vengeance against Claudius. So, Option C) is the Correct Answer.