The two correct answers that demonstrate rhetorical techniques in the passage by Representative Barbara Jordan are:
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metaphor - The phrase "perhaps that 18th-century Constitution should be abandoned to a 20th-century paper shredder" uses a metaphor to emphasize the idea that the Constitution is crucial and must be upheld.
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rhetorical conditional - The conditional phrasing "If the impeachment provision in the Constitution ... will not reach the offenses charged here" sets up a hypothetical situation to provoke thought about the relevance and efficacy of the Constitution.
So, the selected responses are metaphor and rhetorical conditional.