Ethnicity is like your culture. Language, race, and religion all play into your background and culture. However, politics are something that govern the country you live in -- they're not necessarily connected to your background. Therefore, politics would be the correct answer.
The answer to the question about the characteristics of ethnicity is that D. Politics is not a characteristic of ethnicity. Ethnicity is defined by language, race, and religion, which are all cultural identifiers. Politics, although influential in ethnic relations, does not define ethnicity itself.
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