What doctrine was outlined and deemed inviable to amendments in the verdict of Keshavananda Bharthi Vs the State of Kerala?

The basic structure of the constitution

The correct answer is option (3) - Basic structure of the constitution

Kesavananda Bharati case is also known for Basic Structure Doctrine of the Supreme Court. The Kesavananda Bharati vs. State of Kerala case, decided by the Supreme Court of India in 1973, is a landmark judgment that laid down the basic structure doctrine of the Indian Constitution. In a short summary, the case involved a challenge to the Kerala government's attempts to implement land reform laws that would affect the properties owned by the petitioner, Kesavananda Bharati, who was the head of a religious institution.