What is one responsibility that is only for U.S. citizens?

Serving on a jury is a responsibility that is exclusive to U.S. citizens. This duty is essential to the functioning of the American legal system, as it allows citizens to participate directly in the judicial process and ensures that trials are conducted fairly and impartially. Jury service contributes to a democratic society by enabling citizens to take part in upholding justice and making decisions on legal matters that affect their communities.

In contrast, the other choices listed encompass responsibilities that apply to all individuals residing in the U.S., whether they are citizens or not. Paying taxes, obeying laws, and attending school are obligations that do not require citizenship status, as they are fundamental for all residents to maintain societal order and contribute to the well-being of the community.