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The basic unit you selected seems likely related to social groups or communities. Among the responses provided, the option that best exemplifies a social group as a basic unit is:
**people who share the same political values**
This is because they form a social group based on shared beliefs and values, which is a fundamental characteristic of social units. However, "people who live together under a sovereign government" can also describe a political unit or state, which could be another interpretation of a basic unit.
If you need more context to make a better choice, please let me know!