During Indian freedom struggle, which one of the following happened earliest?

To determine the earliest event, we must establish the chronology of the four options. The Gaya Session of the Indian National Congress was held in December 1922, presided over by C.R. Das, following the withdrawal of the Non-Cooperation Movement [t1][t2]. The Simon Commission was appointed in 1927 and arrived in India in early 1928 to review constitutional reforms [c3][c4]. The Gandhi-Irwin Pact, also known as the Delhi Pact, was signed on March 5, 1931, which led to the suspension of the Civil Disobedience Movement and Congress participation in the Second Round Table Conference [c1][c2][c4]. Finally, the Tripuri Session of Congress took place in 1939, famous for the re-election of Subhas Chandra Bose as President against Gandhi's candidate [c4][t4]. Therefore, the Gaya Session (1922) is the earliest event among the choices.

Sources

1. [1] http://pmml.nic.in/downloadInstitutional/249
2. [2] Modern India ,Bipin Chandra, History class XII (NCERT 1982 ed.)[Old NCERT] > Chapter 15: Struggle for Swaraj > Poorna Swaraja > p. 286
3. [3] THEMES IN INDIAN HISTORY PART III, History CLASS XII (NCERT 2025 ed.) > Chapter 11: MAHATMA GANDHI AND THE NATIONALIST MOVEMENT > Fig. 11.17 > p. 314
4. [4] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 19: Civil Disobedience Movement and Round Table Conferences > Karachi Congress Session—1931 > p. 381
5. [5] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 19: Civil Disobedience Movement and Round Table Conferences > Gandhi-Irwin Pact > p. 379
6. [6] https://dn790008.ca.archive.org/0/items/indianstruggle1902subh/indianstruggle1902subh.pdf