The correct answer is (a) 61st Amendment.
The 61st Amendment to the Constitution of India was enacted in 1988. It provided for the creation of a National Capital Territory of Delhi (NCT of Delhi) and for the delimitation of its boundaries. The NCT of Delhi is a union territory, which means that it is directly administered by the central government of India. The capital of India, New Delhi, is located in the NCT of Delhi.
The 61st Amendment also provided for the establishment of a Legislative Assembly for the NCT of Delhi. The Legislative Assembly is responsible for making laws for the NCT of Delhi. The Chief Minister of the NCT of Delhi is the head of the government.
The 61st Amendment was a significant amendment to the Constitution of India. It provided for the creation of a new union territory, the NCT of Delhi, and for the delimitation of its boundaries. It also provided for the establishment of a Legislative Assembly for the NCT of Delhi.
The other options are incorrect.
(b) The 69th Amendment to the Constitution of India was enacted in 1991. It provided for the introduction of Panchayati Raj institutions in India.
(c) The 71st Amendment to the Constitution of India was enacted in 1992. It provided for the introduction of Nagarpalika institutions in India.
(d) The 79th Amendment to the Constitution of India was enacted in 1999. It provided for the introduction of Legislative Councils in certain states of India.