Explanation
Why Correct: The 2024 Seven Judge Bench verdict on sub-categorization of Scheduled Castes was delivered in State of Punjab Vs. Davinder Singh. It overruled the earlier E. V. Chinnaiah Vs. State of Andhra Pradesh judgment, which had held that sub-classification of Scheduled Castes was impermissible. Among the listed choices, E. V. Chinnaiah Vs. State of Andhra Pradesh is therefore the relevant foundational litigation.
Distractor Analysis: Indra Sawhney Vs. Union of India (1992) is the landmark case that upheld the 27% reservation for OBCs and introduced the concept of the 'creamy layer', but it did not deal with sub-categorization of Scheduled Castes. Association for Democratic Reforms Vs. Election Commission of India concerns electoral reforms, not caste reservation. Indra Sawhney Vs. Association for Democratic Reforms is not a real case title.
Takeaway: State of Punjab Vs. Davinder Singh (2024) overruled E. V. Chinnaiah (2004) and allowed states to sub-classify Scheduled Castes for more targeted distribution of reservation benefits.