Explanation:

- Option 1: 1946

The Constituent Assembly was formed in 1946, but the Indian National Congress did not pass a resolution about the Constitution at its session this year.

- Option 2: 1928

The Nehru Report came in 1928, suggesting constitutional reforms, but it wasn't a formal Congress resolution on an independent Constitution.

- Option 3: 1931

At the Karachi Session of 1931, the Congress, led by Sardar Vallabhbhai Patel and with Jawaharlal Nehru’s influence, passed a significant resolution laying out the fundamental rights and key features for the Constitution of Independent India.

- Option 4: 1945

No major resolution on the Constitution by the Congress occurred in this year.

Correct answer: Option 3—1931