The correct answer is option 1 - 1951. The First Amendment of the Indian Constitution took place in 1951. This amendment was introduced to make certain changes and additions to the original Constitution, which had come into effect on January 26, 1950. The First Amendment sought to address some of the practical issues and challenges that arose after the implementation of the Constitution. It introduced a number of changes, including new restrictions on freedom of speech and expression and the right to property. It also allowed the government to make laws that would protect the interests of socially and educationally backward classes. This amendment marked the first major revision of the Indian Constitution since its inception.