The correct answer is: A. Xth
The 73rd Constitutional Amendment added the Xth Schedule to the Constitution, which deals with the Panchayats. The Panchayats are local self-government institutions in India. They are responsible for a wide range of functions, including rural development, agriculture, education, health, and sanitation.
The Xth Schedule lists the powers and functions of the Panchayats. It also provides for the composition of the Panchayats, their elections, and their finances.
The 73rd Constitutional Amendment was passed in 1992. It was one of the most important amendments to the Constitution. It has had a significant impact on the development of local self-government in India.
The other options are incorrect because they do not correspond to any of the schedules in the Constitution.