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A
100
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B
435
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C
538
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D
Varies depending on population
Why this is the answer
The House of Representatives has 435 voting members. This number was set by the Reapportionment Act of 1929 and has not changed since. Each state's number of representatives is based on its population as measured by the census every ten years. The Constitution requires at least one representative per state, so the least populous states (Wyoming, Vermont, Alaska, North Dakota, South Dakota) have one each, while California has 52. Representatives serve two-year terms and all 435 seats are up for election in every even-numbered year. The 538 figure refers to the Electoral College, which includes 435 representatives plus 100 senators plus 3 electors for the District of Columbia.
Source: USCIS Civics Question 21