The correct answer is option 2 - 42nd Amendment. This amendment was passed in 1976 and it made several changes to the Indian Constitution, including the addition of the term ‘secular’ to the Preamble. The Preamble is an introductory statement that outlines the ideals and objectives of the Constitution. By adding the term ‘secular’, the amendment emphasized the importance of religious freedom and the principle of a state that does not promote any specific religion. This amendment aimed to uphold the secular nature of India and ensure equal treatment of all religions. It is important to note that the other options listed (41st, 43rd, and 44th Amendments) did not include the addition of the term ‘secular’ in the Preamble.