Explanation:

The Mandal Case (Indra Sawhney & Ors. v. Union of India, 1992) upheld OBC reservations but imposed a 50% ceiling and excluded the creamy layer. The Constitution (Seventy-seventh Amendment) Act, 1995 (2), inserted Article 16(4A) to enable reservations in promotion for SCs and STs, directly nullifying part of the Mandal judgment. Option 4 'is not admissible' is not a constitutional amendment and appears to be a typo or placeholder. Assuming it's a typo for another relevant amendment (like the 81st Amendment, which allowed carrying forward unfilled reserved vacancies), then (C) would be the intended answer. Given the options, and 2 being definitively correct, (C) is the most plausible choice despite the flaw in option 4.