Option 1: 105th Amendment -> Restored state powers to identify and notify Socially and Economically Backward Classes (SEBCs) for reservation purposes.
Option 2: 88th Amendment -> Related to service tax provisions, not about backward class identification.
Option 3: 91st Amendment -> Dealt with anti-defection law and limiting the size of Council of Ministers.
Option 4: 99th Amendment -> Established the National Judicial Appointments Commission (NJAC) for judicial appointments.
Hence, 105th Amendment -> The 105th Constitutional Amendment Act, 2021 was enacted to clarify and restore the rights of State Governments to maintain their own State Lists of SEBCs. This became necessary after the Supreme Court's interpretation in the Maratha reservation case suggested that the 102nd Amendment (2018) had removed states' power to identify OBCs. The 105th Amendment inserted Article 342A(2) to explicitly preserve states' authority in this matter -> correct