Correct Answer : 1929 Lahore Session
The Purna Swaraj declaration, or Declaration of the Independence of India, was promulgated by the Indian National Congress on 19 December 1929 Lahore Session, resolving the Congress and Indian nationalists to fight for Purna Swaraj.
The flag of India had been hoisted by Congress President Jawaharlal Nehru on 31 December 1929. The Congress asked the people of India to observe 26 January as Independence Day. The flag of India was hoisted publicly across India by Congress volunteers, nationalists and the public.
