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A
Only their political party
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B
All people of their state
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C
Only people who voted for them
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D
The President
Why this is the answer
A U.S. Senator represents all the people of their state. This is a 65/20 civics question. Each state has two senators, and they represent everyone who lives in that state — not just members of their party or only the voters who supported them. This is a key principle of representative government: elected officials serve all their constituents. Members of the House of Representatives, by contrast, represent the people of a specific district within a state. Understanding whom senators represent is part of the system-of-government content on the civics test.
Source: USCIS Civics Question 20 (65/20) — Who Senators Represent