Detailed Solution:
The correct answer is “Keshvanand Bharti vs State of Kerala – 1973”.
The concept of 'Basic Structure of the Constitution' was propounded by the Supreme Court in the case of - Keshvanand Bharti vs State of Kerala – 1973.
This landmark case established the principle that while Parliament has the power to amend the Constitution, it cannot alter its fundamental features or 'basic structure'.