The results of which of the following general elections was considered as a 'Political Earthquake' by political observers?

1967

The correct answer is Option (2) → 1967

"Many contemporary political observers described the election results of 1967 as a ‘political earthquake’. The Congress did manage to get a majority in the Lok Sabha, but with its lowest tally of seats and share of votes since 1952. Half the ministers in Indira Gandhi’s cabinet were defeated. The political stalwarts who lost in their constituencies included Kamaraj in Tamil Nadu, S.K. Patil in Maharashtra, Atulya Ghosh in West Bengal and K. B. Sahay in Bihar.".