The correct answer is (a).
The Lahore session of the Indian National Congress was held in December 1929. At this session, the Congress declared ‘Poorna Swaraj’ or complete independence as its goal. This was a major turning point in the history of the Indian independence movement, as it marked the shift from a policy of seeking dominion status to one of demanding complete independence.
The other options are incorrect. The Karachi session of the Indian National Congress was held in 1931. The Delhi session was held in 1919, and the Bombay session was held in 1934. At none of these sessions was ‘Poorna Swaraj’ declared the goal of the Congress.
The Lahore session of the Indian National Congress was a watershed moment in the history of the Indian independence movement. It marked the shift from a policy of seeking dominion status to one of demanding complete independence. This was a major turning point, and it led to the intensification of the independence struggle.