The Supreme Court of India enunciated the doctrine of "Basic Structure of the Constitution" in

1. A

   The Golaknath Case in 1967

   Golaknath (1967) held that Parliament could not amend Fundamental Rights (prospective overruling). It did not propound the basic-structure doctrine.

2. B

   The Keshavanand Bharati Case in 1973

   Kesavananda Bharati (1973) held that Parliament’s amending power cannot destroy the Constitution’s basic structure. That is the official key.

3. C

   The Shankari Prasad Case in 1951

   Shankari Prasad (1951) upheld the First Amendment and treated amendment as not ‘law’ under Article 13.

4. D

   The Sajjan Singh Case in 1965

   Sajjan Singh (1965) followed Shankari Prasad on Parliament’s wide amending power.

Summary. Official key is (b) Kesavananda Bharati, 1973. Golaknath froze amendments to rights; Kesavananda replaced that with basic structure. Minerva Mills (1980) reaffirmed it. Honour the stored letter (b).