The correct answer is: b) Indian Constitution.
The Indian Constitution is the supreme law of India. It was adopted on 26 November 1949, and came into effect on 26 January 1950. The Constitution provides for a federal system of government, with power divided between the central government and the state governments. Sikkim is one of the 28 states of India, and as such, it has certain powers and responsibilities devolved to it under the Constitution. These powers and responsibilities include matters such as education, health, agriculture, and local government.
The United Nations Charter is an international treaty that was signed on 26 June 1945. It sets out the purposes and principles of the United Nations, and establishes the organization’s structure and powers. The Charter does not specifically mention Sikkim.
The State Autonomy Act is an act of the Indian Parliament that was passed in 1986. It provides for greater autonomy to the states of India. However, the Act does not apply to Sikkim.
The Geneva Conventions are a series of international treaties that were adopted in 1864, 1906, 1929, and 1949. They set out the rules of international humanitarian law, which is the law that applies in armed conflict. The Geneva Conventions do not specifically mention Sikkim.