The correct answer is (a) 43rd Amendment.
The 43rd Amendment to the Constitution of India was enacted in 1974. It was the first amendment to the Constitution to be passed after the Emergency. The amendment made several changes to the Constitution, including the introduction of the concept of Lok Adalats.
Lok Adalats are voluntary, non-judicial bodies that are set up to resolve disputes between parties. They are presided over by a retired judge or a senior lawyer. Lok Adalats have been successful in resolving a large number of disputes, and they have been praised for their efficiency and cost-effectiveness.
The other options are incorrect because they are not the amendments that gave legal status to Lok Adalats. The 44th Amendment was enacted in 1978, the 45th Amendment was enacted in 1980, and the 46th Amendment was enacted in 1982. None of these amendments made any changes to the provisions of the Constitution relating to Lok Adalats.