After the formation of ministries in the provinces in 1937, Congress rules lasted for

The correct answer is A) 28 months. Congress ministries took office in July 1937 in the provinces where it had won elections under the Government of India Act, 1935. They resigned in late October and early November 1939, after the Viceroy, Lord Linlithgow, declared India a belligerent in the Second World War without consulting Indian leaders. Counting from July 1937 to the end of October 1939 gives roughly 28 months.

• B, C, D (29, 30, 31 months): These overshoot the timeline. Some sources round up to 29 months if the resignations are counted to November 1939, but the standard figure used in exams is 28 months.

The core concept is provincial autonomy and the limits of the 1935 Act. It also links to the Mains theme of how the Congress Working Committee used ministry resignations as political protest, and to the Muslim League's observance of 'Deliverance Day' on 22 December 1939.

Trap: Aspirants often pick 29 months by counting to the November resignation date or by remembering 'about 2.5 years' loosely. Anchor the answer to the Oct-Nov 1939 resignations and the July 1937 start.