Which of the following responsibilities is required of citizens in the U.S.?

Serving on a jury when called is a fundamental responsibility of U.S. citizens, as it upholds the justice system and ensures a fair trial by peers. This duty is rooted in the Sixth Amendment of the U.S. Constitution, which guarantees the right to a jury trial in criminal cases. The participation of citizens in jury duty is essential for maintaining the democratic process and the rule of law, allowing community members to contribute to judicial proceedings and help ensure that justice is served.

While voting, running for office, and paying for public services are important civic responsibilities, they are not mandatory in the same way that jury duty is. Citizens have the right to choose whether or not to vote or run for office, and while contributing to public services is expected, it is typically done through taxes rather than being classified as a direct responsibility.