Which area is defined as waters wholly within one state?

The correct choice describing waters wholly within one state is internal waters. These are navigable bodies of water that are located the landward side of the baseline from which the breadth of the territorial sea is measured. Internal waters include rivers, lakes, and bays that are under the jurisdiction of a single state, meaning that the state has full sovereignty over these waters and can enforce its laws within them.

This contrasts with exclusive state waters, which typically encompass areas extending a certain distance from the coast and may include rights similar to a country's Exclusive Economic Zone (EEZ), but do not pertain to the definition of waters that are entirely within one state's boundaries.

Contiguous zone refers to a maritime zone outside the territorial sea where a state can exert certain controls, and the foreign territorial sea refers to the waters adjacent to a foreign state’s coast, which are not under the jurisdiction of the U.S. or the relevant state. Understanding these definitions is crucial for distinguishing various maritime zones and acknowledging state sovereignty.