The question is asking during which Five Year Plan in India did three specific events occur: the implementation of Emergency, new elections, and the election of the Janata Party. The Five Year Plans are strategic plans formulated by the Government of India for economic development. The three events mentioned in the question occurred during the Fifth Five Year Plan.

1) Third Five Year Plan (1961–1966): This period is too early for the events mentioned.

2) Fourth Five Year Plan (1969–1974): The events are after this period.

3) Fifth Five Year Plan (1974–1979): This is the correct period. The Emergency (a 21-month period from 1975 to 1977 when Prime Minister Indira Gandhi had a state of emergency declared across the country) was imposed. New elections took place after the Emergency, and the Janata Party was elected to power in 1977.

4) Sixth Five Year Plan (1980–1985): This period is too late for the events mentioned.

Hence, the correct answer is option 3, Fifth Five Year Plan.