How do the conflicts between Octavius and Mark Antony as well as Brutus and Cassius in act 4 of The Tragedy of Julius Caesar develop the play’s plot?

Octavius challenges Antony’s authority in Act 4, revealing tension between the two leaders that foreshadows later struggles over control of Rome. Brutus and Cassius argue over money and military decisions, exposing differences in their values and straining the friendship that had supported their republican cause. These conflicts develop the plot by showing that both alliances are under pressure as the conflict over Rome continues. Choice A captures both developments.

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