In 1929, under the presidency of ______, the Lahore Congress formalised the demand of Purna Swaraj.

Jawaharlal Nehru

The correct answer is Option 4- Jawaharlal Nehru

The Lahore Congress of 1929, under the presidency of Jawaharlal Nehru, formalised the demand of Purna Swaraj (complete independence) for India.

The Lahore session of the Indian National Congress in 1929 was significant because it declared the goal of complete independence (Purna Swaraj) from British rule. This marked a shift from earlier demands for dominion status. It led to the launch of the Civil Disobedience Movement and fostered unity within the Congress. The declaration gained international attention and support for India's struggle for self-rule. Overall, it was a pivotal moment in India's journey toward independence.