In which of the following cases, the Supreme Court of India has specifically said that 'federal structure' is the basic feature of the Constitution?

Correct option is B

In S.R. Bommai v. Union of India (1994), the Supreme Court held that federalism is a basic feature of the Constitution. The case revolved around the misuse of Article 356 (President’s Rule) and laid down strict guidelines, reinforcing the federal nature of Indian polity as part of the basic structure doctrine.