The correct answer is option 2, which deals with the extension of reservation in educational institutions. The Constitution (93rd Amendment) Act was passed in 2005 to provide reservation for socially and educationally backward classes in admission to educational institutions, including private unaided institutions, except for minority educational institutions.

Option 1, local self-government, is not covered by the Constitution (93rd Amendment) Act. Local self-government is primarily governed by the provisions of the Constitution`s Articles 243 to 243O, which were inserted by the 73rd and 74th Amendments. These amendments provide for the establishment of a three-tier system of local self-governance consisting of Panchayats at the village level, Municipalities at the urban level, and Municipal Corporations in larger cities.

Option 3, basic structure of the Constitution of India, is not directly related to the Constitution (93rd Amendment) Act. The concept of the basic structure of the Constitution was established by the Supreme Court in the landmark case of Kesavananda Bharati v. State of Kerala (1973). According to this doctrine, certain fundamental features of the Constitution cannot be amended by the Parliament.

Option 4, appointment of judges in the Supreme Court of India, is also