Which of the following Amendment Acts added four new subjects (Article 39, 39A, 43A, 48A) in the Directive Principles of State Policy?

Correct option is A

The correct answer is (a) 42nd Amendment Act, 1976.
 The 42nd Amendment Act, 1976 added four new subjects to the Directive Principles of State Policy in the Indian Constitution.
 Articles added: Article 39, 39A, 43A, and 48A.
 Article 39: states that the state will make sure that they provide sufficient sources of subsistence to all people, along with women, equal wages for equivalent work.
 Article 39A: provide free legal aid to ensure access to justice for all citizens..
 Article 43A: Participation of workers in management of industries.
 Article 48A: Protection and improvement of the environment and safeguarding of forests and wildlife.
 The 42nd Amendment is often referred to as the "mini-Constitution" due to its extensive changes to the Constitution.