Detailed Solution:
The correct answer is “The Supreme Court enunciated the doctrine of "basic features" of the Constitution”.
The importance of the Kesavananda Bharati case (Kesavananda Bharati v. State of Kerala, 1973) lies in the fact that the Supreme Court of India enunciated the doctrine of the "basic structure" of the Constitution. This landmark decision established that while Parliament has wide powers to amend the Constitution, it cannot alter the basic structure or framework of the Constitution.