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A
Two years
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B
Four years
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C
Six years
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D
Until they choose to retire
Why this is the answer
US Representatives serve two-year terms. The Constitution sets this short term because the framers wanted the House to remain closely accountable to the people. All 435 House seats are up for election in every general election (every even-numbered year). There is no constitutional term limit. The Senate's six-year terms, by contrast, were designed to insulate Senators from short-term political pressure. The President's four-year term sits between the two. The combination of staggered terms across the branches was intended to slow rapid political change and force compromise.
Source: USCIS Civics Question 23