Concept:Citizenship is acquired through clear legal processes that link an individual to a state.
Explanation:The two main ways of acquiring citizenship are by birth and by naturalization.
Citizenship by birth is automatic.
It applies to a person born within the territory of a country.
It may also apply to a child born abroad when one or both parents are citizens of that country.
Naturalization is a legal process for foreigners.
A foreign national can obtain citizenship after meeting legal conditions.
These conditions often include a required period of residence, language proficiency, and an oath of allegiance.
The person must also show knowledge of the host country's constitution and laws.
Therefore, the correct method of acquisition is through birth and naturalization.
Answer:C. birth and naturalization