In which of the following cases did the Supreme Court of India pronounce the theory of the ‘Basic Structure’ of the Constitution?

Correct option is A

The Supreme Court of India pronounced the theory of the ‘Basic Structure’ of the Constitution in the historic judgment of Kesavananda Bharati v. State of Kerala, delivered on April 24, 1973.
 The case was heard by a bench of 13 judges, which is the largest bench ever assembled by the Supreme Court of India. In this case, the court held that there are certain basic features of the Constitution that cannot be altered by the Parliament through its amending power under Article 368.
 The court also ruled that the power to amend the Constitution is not unlimited and that it cannot be used to destroy the basic structure of the Constitution. This judgment has become a landmark in Indian constitutional law and has had a far-reaching impact on the interpretation and development of the Constitution.