Explanation
The correct answer is A: Forty-Second Amendment.
The words "Socialist" and "Secular" were inserted into the Preamble of the Constitution of India by the 42nd Amendment Act of 1976. The 42nd Amendment Act was passed during the period of emergency rule in India and made several changes to the Constitution, including the addition of these two words to the Preamble.
The addition of the words "Socialist" and "Secular" reflected the political and social ideologies of the time and represented a commitment to socialist principles and the separation of religion and state. The Preamble now reads as follows: "We, the people of India, having solemnly resolved to constitute India into a Sovereign Socialist Secular Democratic Republic and to secure to all its citizens: Justice, social, economic and political; Liberty of thought, expression, belief, faith, and worship; Equality of status and opportunity; and to promote among them all Fraternity assuring the dignity of the individual and the unity and integrity of the Nation."
The 42nd Amendment Act also made several other changes to the Constitution, including the amendment of fundamental rights and the insertion of fundamental duties. However, some of these changes were later repealed or modified by subsequent amendments to the Constitution.
