When citizens and noncitizen nationals leave and enter the United States:

• A. They are inspected.
• B. They are examined.
• C. They are subject to removal.
• D. None of the above.

Answer: (B)

The correct choice emphasizes that when citizens and noncitizen nationals enter and exit the United States, they undergo a process known as examination. This examination is part of the border control and immigration procedure implemented by U.S. Customs and Border Protection (CBP). During this examination process, officials check identifying documents such as passports, assess the individual's eligibility to enter or re-enter the U.S., and ensure compliance with legal requirements. This step is crucial in maintaining national security and controlling immigration effectively.

While "inspected" might also seem relevant, in this context, the term "examined" specifically refers to the thorough process that includes various checks and assessments at borders. The term "subject to removal" applies in different circumstances, typically concerning individuals who are unauthorized to enter or remain in the United States, rather than citizens and noncitizen nationals.