The two options that accurately reflect how Cinna's request to get Brutus involved affects Cassius are:
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Cinna's request makes Cassius ask him to take an incriminating letter to Brutus. - Cassius gives Cinna specific instructions to deliver papers to Brutus in order to persuade him to join their conspiracy.
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Cinna's request makes Cassius trust him to return to Pompey's Theatre and meet Cassius there. - Cassius expresses confidence in Cinna's ability to complete the task and return to the group, showing trust in Cinna's loyalty to their cause.