In India, the fourth General election to the Lok Saba was held in:

February 1967

The correct answer is Option 2 - February 1967

Against the backdrop of growing public discontent and the deepening division among political factions, the fourth general elections for the Lok Sabha and State Assemblies took place in February 1967. For the first time, the Congress Party faced the electorate without Nehru's presence. The election results sent shockwaves through the Congress Party, both nationally and at the state levels. Numerous contemporary political analysts labeled the outcome as a 'political earthquake.' Although the Congress Party did secure a majority in the Lok Sabha, it obtained its lowest count of seats and share of votes since 1952. Significantly, half of the ministers within Indira Gandhi's cabinet experienced defeat. Several esteemed political figures, such as Kamaraj in Tamil Nadu, S.K. Patil in Maharashtra, Atulya Ghosh in West Bengal, and K. B. Sahay in Bihar, suffered losses in their respective constituencies.