What limitation exists for non-U.S. citizens unlawfully present in the U.S. and seeking admission after leaving while under order of removal?

The correct choice highlights a critical aspect of immigration law regarding non-U.S. citizens who have been unlawfully present in the United States. When individuals are unlawfully present for more than one year and subsequently leave the U.S. while under an order of removal, they become subject to a significant penalty before being eligible for re-entry. Specifically, these individuals face a 10-year ban from being readmitted to the U.S. This provision is designed as a deterrent against unlawful presence and reinforces the importance of adhering to immigration laws.

In contrast, choices such as immediate re-entry and ineligibility for 3 years do not accurately reflect the legal consequences for those with prolonged unlawful presence. The option regarding permission based on employment is also misleading; while there are certain avenues for lawful re-entry based on employment, it does not apply in cases of prior unlawful presence leading to an order of removal.