Explanation:

29th Amendment in Constitution of India
Statement of Objects and Reasons appended to the Constitution (Thirty-second Amendment) Bill, 1972 which was enacted as the Constitution (Twenty-ninth Amendment) Act, 1972.
In the course of implementation, the State Government faced serious practical difficulties and to overcome them, that Act was extensively amended by the Kerala Land Reforms (Amendment) Act, 1969 (Act 35 of 1969) and by the Kerala and Reforms (Amendment) Act, 1971 (Act 25 of 1971). Certain crucial provisions of the principal Act as amended were challenged in the High Court of Kerala and in the Supreme Court, creating a climate of uncertainty in the effective implementation of land reforms. 
It is, therefore, proposed to include the Kerala Land Reforms (Amendment) Act, 1969 and the Kerala Land Reforms (Amendment) Act, 1971 in the Ninth Schedule to the Constitution so that they may have the protection under article 31B and any uncertainty or doubt that may arise in regard to the validity of those Acts is removed. The Bill seeks to achieve this object.

Hence option 1st is correct.