The correct answer is (a) 61st Amendment.
The 61st Amendment to the Constitution of India, enacted in 1989, lowered the voting age from 21 to 18 years. This amendment was passed in response to the Mandal Commission report, which recommended affirmative action for Other Backward Classes (OBCs). The amendment was also seen as a way to increase youth participation in the electoral process.
The 51st Amendment, enacted in 1976, inserted Article 32A into the Constitution, which provides for the appointment of a Chief Election Commissioner and Election Commissioners. The 41st Amendment, enacted in 1976, inserted Article 31B into the Constitution, which provides for the overriding effect of certain laws made by Parliament. The 71st Amendment, enacted in 1992, inserted Article 243G into the Constitution, which provides for the establishment of Panchayati Raj institutions.
The 61st Amendment was a significant step in the expansion of democracy in India. It gave millions of young people the right to vote and participate in the political process. The amendment has been credited with increasing voter turnout and improving the quality of elections in India.