The correct answer is option 2, the 42nd Amendment. The 42nd Amendment is also known as the `Mini Constitution` of India because it made significant changes and additions to the original constitution. It was enacted in 1976 during the period of emergency in India.

Option 1, the 7th Amendment, is incorrect because it primarily dealt with the reorganization of states and did not have the same magnitude of changes as the 42nd Amendment.

Option 3, the 44th Amendment, is incorrect because although it brought some amendments to the constitution, it did not have the same level of impact as the 42nd Amendment.

Option 4, the 74th Amendment, is incorrect because it primarily deals with the provisions for local self-government in urban areas and does not have the same significance as the 42nd Amendment.