Correct Answer: (b) First Amendment
Solution:On 18 June 1951, the Ninth Schedule was added to the Indian Constitution for the abolishment of the Zamindari system. Out of 284 such laws which are shielded from judicial review, 90 per cent of laws are about agriculture and landholding. The Schedule contains a list of central and state laws which cannot be challenged in courts and was added by the Constitution (First Amendment) Act, 1951. Therefore, the correct option is (b).