The Ninth Schedule was introduced in the Constitution of India during the prime ministership of

1. A

   Jawaharlal Nehru

   (a) Jawaharlal Nehru. The Ninth Schedule was added by the First Amendment, 1951, to protect agrarian reform laws from Article 13/19/31 challenges, during Nehru’s prime ministership. That is the official key.

2. B

   Lal Bahadur Shastri

   (b) Lal Bahadur Shastri. Shastri’s short tenure (1964–66) did not introduce the Ninth Schedule, so this is not the key.

3. C

   Indira Gandhi

   (c) Indira Gandhi. She used and expanded the Schedule (e.g. 29th, 39th, 42nd Amendments), but she did not introduce it, so this is not the key.

4. D

   Morarji Desai

   (d) Morarji Desai. The 44th Amendment is his government’s mark, not the birth of the Ninth Schedule, so this is not the key.

Summary. Official key is (a) Jawaharlal Nehru. First Amendment, 1951, created the Ninth Schedule after early zamindari-law setbacks. Later prime ministers added entries; Indira’s era is expansion, not origin. Honour the stored letter (a).