Ais "a corporate group that shares an identity based on such traits as history, culture, territory, and so on, and that recognizes a shared political destiny. a group that is politically mobilized to achieve certain goals, usually including political recognition, rights, and sometimes an independent state."

The answer is "Nation".

A nation refers to a steady group of individuals, framed based on a typical dialect, domain, financial life, ethnicity or mental make-up showed in a typical culture. It is unmistakable from a people,[1] and is more conceptual, and more plainly political than an ethnic group. It is a social political group that has turned out to be aware of its self-governance, solidarity, and specific interests.

Ithink it would be choice b (county). hope this you!