The correct option is A ruling of the Supreme Court..
Explanation
The concept of the "Creamy Layer" refers to the exclusion of the socially and economically advanced members of a backward class from the benefits of reservation. This ensures that the benefits of affirmative action reach the truly backward sections of society.
Analysis of Options
- A ruling of the Supreme Court.: Correct. The concept of "Creamy Layer" was introduced by the Supreme Court in the landmark judgment of Indra Sawhney vs. Union of India (1992), also known as the Mandal Commission case. The Court upheld the 27% reservation for Other Backward Classes (OBCs) but stipulated that the "creamy layer" (advanced sections) within the OBCs must be excluded from this quota.
- A Constitutional Amendment Act passed by Parliament.: Incorrect. While Parliament has passed Constitutional Amendment Acts regarding reservation (e.g., the 103rd Amendment for EWS), the specific concept of the "Creamy Layer" originated from judicial interpretation, not a legislative amendment.
- An executive order of the President.: Incorrect. The executive order issued by the V.P. Singh government implemented the Mandal Commission recommendations, but it did not originally include the "Creamy Layer" exclusion. The exclusion was added subsequently based on the Supreme Court's directive.
- The Constituent Assembly during the drafting of the Constitution.: Incorrect. The Constituent Assembly discussed backward classes and reservation provisions (Article 16(4)), but the specific terminology and concept of "Creamy Layer" were not formulated during the drafting of the Constitution.
Key Takeaway: The Indra Sawhney case (1992) is the source of the "Creamy Layer" doctrine, mandating that advanced sections within OBCs be excluded from reservation benefits to uphold the principle of equality.