AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Option B — The Lahore Congress (December 1929), under Jawaharlal Nehru's presidency, formalised the demand for Purna Swaraj (complete independence) and declared 26 January 1930 as Independence Day.
The passage from Section 3 ("Towards Civil Disobedience") directly states: "In December 1929, under the presidency of Jawaharlal Nehru, the Lahore Congress formalised the demand of 'Purna Swaraj'… It was declared that 26 January 1930, would be celebrated as the Independence Day." The other options refer to different events — the Non-Cooperation Movement (Nagpur 1920), Gandhi-Irwin Pact (1931), and Swaraj Party (1922). The correct answer is B.