Answer: "Casca joins the conspiracy because Cassius uses various means to manipulate his emotions."
It is <u>false </u>that Claudius tells Rosencrantz and Guildenstern that they must tell the players not to obey any of Hamlet's orders - if you are referring to Shakespeare's "Hamlet."
This never happened in the play. Claudius sent these two men to find and kill Hamlet, however, the tide has turned, and in the end, Hamlet managed to have both of them killed. They were his childhood friends, yet they betrayed him on behalf of his father's murderer.
C is the right one. Unlike quotations or paraphrased ideas, information that's considered "common knowledge" doesn't need to be cited. "Common knowledge" is information that's considered widely known or easily verified.