The correct answer is D. Gram Sabha, Panchayat Samiti, Zilla Parishad.
The Panchayati Raj System is a three-tier system of local self-government in India. It consists of the Gram Sabha (village assembly), the Panchayat Samiti (block panchayat), and the Zilla Parishad (district council).
The Gram Sabha is the lowest level of the Panchayati Raj System. It is a body of all the adult members of a village. The Gram Sabha is responsible for planning and implementing development schemes in the village. It also has the power to levy taxes and collect fees.
The Panchayat Samiti is the intermediate level of the Panchayati Raj System. It is a body of elected representatives from the villages in a block. The Panchayat Samiti is responsible for planning and implementing development schemes in the block. It also has the power to levy taxes and collect fees.
The Zilla Parishad is the highest level of the Panchayati Raj System. It is a body of elected representatives from the Panchayat Samitis in a district. The Zilla Parishad is responsible for planning and implementing development schemes in the district. It also has the power to levy taxes and collect fees.
The Panchayati Raj System is a vital part of the Indian democracy. It provides a platform for the people to participate in the decision-making process and to hold their elected representatives accountable. The Panchayati Raj System has been instrumental in bringing about development and social change in rural India.
The other options are incorrect because they do not represent the three-tier structure of the Panchayati Raj System.