Step 1: Understanding the Question:
The question asks us to identify the specific constitutional amendment that introduced a 10% reservation for the Economically Weaker Sections (EWS) of society in education and public employment.
Step 2: Key Concepts and Approach:
We must identify the amendment that added new clauses to Articles 15 and 16 to enable economic-based reservation, bypassing the traditional caste-only reservation framework.
Step 3: Detailed Explanation:
• The 103rd Amendment Act, 2019: This amendment introduced a 10% quota for citizens belonging to the Economically Weaker Sections who are not covered under existing SC, ST, or OBC reservation schemes.
• Insertion of Article 15(6): This clause allows the state to make special provisions, including reservation in educational institutions, for the advancement of EWS.
• Insertion of Article 16(6): This clause allows the state to reserve up to 10% of public employment posts for EWS.
• Judicial Challenge: In Janhit Abhiyan v. Union of India (2022), a 5-judge bench of the Supreme Court upheld the constitutional validity of the 103rd Amendment by a 3:2 majority, ruling that reservation based solely on economic criteria does not violate the Basic Structure.
Step 4: Final Answer:
The 10% EWS reservation was introduced by the 103rd Constitutional Amendment Act. Thus, Option A is correct.