Final answer:
3. A sovereign state governs its own territory and determines its own affairs.
Step-by-step explanation:
A sovereign state is defined as a state that exercises supreme authority within a given territory and determines its own affairs. It governs its own territory and has the power to make decisions about its political and economic systems. Its territory is not governed by any external control, such as the United Nations Security Council.
Therefore, the correct statement about a sovereign state is that 3. it governs its own territory.