March 1930, which is well-known in the freedom movement of India, is…

Each major phase of India's freedom movement is tied to a specific launch date and location. Identifying which event a stated month and year refers to requires matching that date against the movement's known chronology, not just its name.

March 1930 marks the start of the Civil Disobedience Movement: on 12 March 1930, Mahatma Gandhi set out from Sabarmati Ashram with a group of followers and walked about 390 km to the coastal village of Dandi, arriving on 5 April 1930 and breaking the British salt law on 6 April 1930 by making salt from seawater. This Dandi March (Salt Satyagraha) is the event conventionally associated with March 1930.

The remaining options belong to different years and are ruled out by their own chronology:

• Partition of Bengal — took effect on 16 October 1905 under Viceroy Lord Curzon, dividing the Bengal Presidency along religious lines; it was annulled in 1911.

• Non-Cooperation Movement — launched on 1 August 1920 by the Indian National Congress in conjunction with the Khilafat movement, calling for the boycott of British goods, titles, and institutions.

• Quit India Movement — launched on 8 August 1942 by the Indian National Congress at its Bombay session, with the call "Do or Die," following the failure of the Cripps Mission.

Since only the Dandi March (Salt Satyagraha) falls within March 1930, it is the event associated with that month.