What is one promise you make when you become a U.S. citizen?

• A. obey the laws of the United States
• B. defend the Constitution and laws of the United States
• C. serve in the U.S. military
• D. serve the nation

Answer: (B)

When someone becomes a U.S. citizen, they take an oath that includes a clear commitment to the country’s legal framework. The essential promise is to defend the Constitution and laws of the United States, showing a pledge to protect the constitutional order and the rule of law that govern the nation.

That’s why this option is the best choice: it matches the exact oath language about defending the Constitution and laws. Obeying laws is a general citizen duty, but the oath specifically calls for defending the constitutional framework. Serving in the military is optional and not a required part of the oath, and “serving the nation” is too vague to capture the formal pledge.