In which year did India conduct its first ever 'Nuclear test'?

1974

The correct answer is Option 2 - 1974

India has faced traditional (military) and non-traditional threats to its security that have emerged from within as well as outside its borders. Its security strategy has four broad components, which have been used in varying combinations from time to time. The first component was strengthening its military capabilities because India has been involved in conflicts with its neighbours — Pakistan in 1947–48, 1965, 1971 and 1999; and China in 1962. Since it is surrounded by nuclear-armed countries in the South Asian region, India’s decision to conduct nuclear tests in 1998 was justified by the Indian government in terms of safeguarding national security. India first tested a nuclear device in 1974.