The correct answer is: c) Preserve the unique cultural and social character of Sikkim.
Article 371F of the Indian Constitution is a special provision that grants special status to the state of Sikkim. The article was inserted into the Constitution in 1975, after Sikkim became the 22nd state of India.
The main aim of Article 371F is to preserve the unique cultural and social character of Sikkim. The article does this by granting the state a number of special powers, including the power to make its own laws on matters relating to land, forests, water, and other natural resources. The article also prohibits the Parliament of India from making any laws that would affect the religious or social practices of the people of Sikkim.
Option a) is incorrect because Article 371F does not allow Sikkim to retain its own monarchy. The monarchy was abolished in Sikkim in 1975, after the state became a part of India.
Option b) is incorrect because Article 371F does not enforce Hindu religious laws. The article does not mention any particular religion, and it does not give the state of Sikkim any special powers to make laws on religious matters.
Option d) is incorrect because Article 371F does not prohibit any future constitutional amendments affecting Sikkim. The article does, however, require the President of India to consult the Governor of Sikkim before making any such amendments.