Who elects members of the House of Representatives?

What does this answer mean?

Citizens from their congressional district elect members of the House of Representatives. Each district holds its own election, and the voters who live there choose one representative.

From the start, the Constitution has said House members are chosen by the people every second year. That made the House the part of the federal government closest to the voters, while senators were originally chosen by state legislatures.

Every House seat is up for election every two years. The number of seats each state gets is updated after every census, which happens every 10 years, so a state's districts can change after a census.

Compare this with the Senate: senators are elected by citizens from the whole state. And only U.S. citizens can vote in federal elections, which is another question on the test.

At the interview, say "citizens from their district."