उत्तर : 3. "केशवानंद भारती बनाम केरल राज्य"
व्याख्या :

It was the Kesavananda Bharati case that brought this doctrine into the limelight. It held that the “basic structure of the Indian Constitution could not be abrogated even by a constitutional amendment”. The judgement listed some basic structures of the constitution as: Supremacy of the Constitution.