6.
The answer is: C
Explanation
The correct option is C: 86th Amendment.
The 86th Amendment Act of 2002 added Article 21A to the Indian Constitution, which provides for free and compulsory education to all children between the ages of six and fourteen years. This amendment made education a fundamental right, ensuring that every child has access to basic education. It also led to the enactment of the Right of Children to Free and Compulsory Education (RTE) Act, 2009, which outlines the responsibilities of the government and other stakeholders in providing free and compulsory education to children.