Answer:
The correct answer is: Alluding to Pompey invokes the history of his opposition to Caesar, showing that the conspirators in the play are part of a longstanding battle against a tyrant.
Step-by-step explanation:
In this excerpt, Cassius and Casca are alluding to Pompey's opposition to Caesar in his battle against the tyrant. Cassius says the people of Rome are responsible for Caesar's tyranny because they act like sheep and easy prey.
He and Casca made a deal about the conspiracy against Caesar, so Cassius said he had already convinced some of the most distinguished Romans to join them. They plan to organize a meeting where they will discuss some important details about the conspiracy and decide when and how they will kill Caesar.
Pompey was married to Caesar's daughter, and, by the time he joined the senate in order to oppose Caesar. However, his attempt was meaningless because he was murdered by his allies after his forces were defeated in a rebellion against Caesar. Therefore, they make allusion to Pompey and his battle against a tyrant.