Final answer:
A sovereign state enjoys full legal equality with other states.
Step-by-step explanation:
The correct answer is C. A sovereign state enjoys full legal equality with other states. A sovereign state is a state that exercises supreme authority within a given territory and determines its own affairs in accordance with its own interests and aspirations. It is not obligated to be a member of the World Trade Organization (option A), its political and economic systems are not dependent on other nations (option B), it has the power to enter into agreements with select nations as well as other states (option D), and it is not bounded by external control (option E).