CUSA primarily deals with which aspect of immigration?

The correct choice highlights that CUSA, which stands for the Citizenship and Immigration Services Agency, primarily focuses on citizen applications. This includes the processing and adjudication of applications related to naturalization and citizenship. Individuals applying for citizenship must meet specific eligibility criteria, undergo background checks, and demonstrate their knowledge of the English language and U.S. civics. Therefore, the core mission of CUSA revolves around ensuring that individuals seeking to become U.S. citizens fulfill all required steps and legal obligations.

Other areas like criminal investigations, visa enforcement, and fraud investigations are indeed significant aspects of immigration enforcement and regulation, typically handled by different agencies or divisions within the broader immigration framework. For instance, criminal investigations would often fall under the jurisdiction of law enforcement agencies focused on immigration violations, while visa enforcement may involve monitoring and ensuring compliance with visa regulations, which is also outside the primary function of CUSA focused specifically on citizen applications. Fraud investigations may be associated with various forms of immigration fraud and handled by specific units within the Department of Homeland Security, rather than the core mission of processing citizenship applications.