Who oversees police agencies at the national level in the United States?

The correct choice reflects the fact that there is no single national governing body that oversees police agencies in the United States at the national level. Instead, police agencies operate under the jurisdiction and authority of various state and local governments. Each state has its own laws and regulations regarding policing, and local agencies are accountable to their respective municipalities.

While the federal government plays a role in law enforcement through agencies such as the FBI and DEA, it does not exert comprehensive oversight over all police agencies across the country. State and local agencies maintain their own operational independence and decision-making authority, which is crucial for tailoring law enforcement practices to the specific needs of their communities.

International police organizations, while they facilitate collaboration in cross-border crime and share best practices, do not have jurisdiction over domestic police enforcement in the U.S. Therefore, the decentralized nature of law enforcement in the United States, governed primarily by state and local entities, makes the chosen answer accurate.