Which of the following events occurred first?
1) Indira Gandhi's assassination
2) Lal Bahadur Shastri's tenure as Prime Minister
3) Coalition politics emerging in the Lok Sabha elections
4) Indira Gandhi became Prime Minster of India

2

Years associated with the mentioned events:

1) Indira Gandhi's assassination in 1984
2) Lal Bahadur Shastri's tenure as Prime Minister was from 1964 to 1966
3) Coalition politics emerged in the 1967 Lok Sabha elections
4) Indira Gandhi became Prime Minister of India in 1967