In which one of the following cases, the Supreme Court decided that there are some basic features of the Constitution that cannot be amended?

Keshavananda Bharti Case

The correct answer is Option (2) → Keshavananda Bharti Case

In the Keshavananda Bharti Case (1973), the Supreme Court of India ruled that Parliament cannot alter the "basic structure" of the Constitution, even through constitutional amendments. This is known as the Basic Structure Doctrine, and it is a landmark judgment in Indian constitutional history.