Article 9 of the Indian Constitution deals with

The correct option is: Persons who voluntarily acquire foreign citizenship

Article 9 of the Constitution of India contains provisions regarding the termination of Indian citizenship upon the voluntary acquisition of citizenship of another country. It states that if a person voluntarily acquires the citizenship of any foreign state, they shall no longer be a citizen of India, nor will they be deemed to be a citizen of India under the preceding articles (Articles 5, 6, or 8).

India does not allow dual citizenship, and Article 9 acts as the constitutional foundation for this principle. Thus, citizenship is automatically forfeited the moment a person voluntarily accepts the citizenship of another nation.