The purposes of the imagery in this excerpt are:
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To emphasize how dangerously packed the streets are - The mention of the throng following Caesar and the description of the "narrow" street highlight the crowd's density and the potential danger it poses to a "feeble man."
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To help the reader picture the excitement in the crowd that follows Caesar - The imagery evokes a sense of anticipation and excitement that surrounds Caesar, illustrating his importance and the fervor of his followers.
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To demonstrate how determined the soothsayer is to deliver his message to Caesar - The soothsayer's intention to find a place "more void" illustrates his determination to communicate with Caesar, despite the challenges posed by the crowd.
Thus, the selected options effectively capture the intended purposes of the imagery in the excerpt.