The correct answer is: a) Seventh Schedule.
The Seventh Schedule of the Indian Constitution lists the powers of the Union and the States. The Union List contains 97 items, which are subjects on which the Parliament has exclusive power to legislate. The State List contains 66 items, which are subjects on which the State Legislatures have exclusive power to legislate. The Concurrent List contains 47 items, which are subjects on which both the Parliament and the State Legislatures have power to legislate.
The Preamble to the Indian Constitution states the objectives of the Constitution and the principles on which it is based. The Fundamental Rights are the basic rights and freedoms that are guaranteed to all citizens of India. The Directive Principles of State Policy are principles that the State should follow in making laws and policies.
The Seventh Schedule is the most important schedule of the Indian Constitution because it outlines the division of powers between the Centre and the States. The division of powers is important because it ensures that both the Centre and the States have the powers they need to function effectively.