56.
The answer is: C
Explanation
The correct option is C: Union of states.
According to Article 1 of the Constitution of India, India, that is Bharat, shall be a Union of States. This means that India is a federal system with a strong central government that can override the states on certain matters. The Constitution also gives the Parliament the power to admit, create, or reorganize the states. Therefore, India is not a federation of states, a quasi federal, or a unitary state of a special type, but a union of states.