The correct answer is B: II, IV, III, I
Kheda (1917) → Ahmedabad Mill Workers (1918) → Rowlatt (1919) → Salt Satyagraha (1930).
The examiner tests knowledge of the chronological sequence of Gandhi's major satyagrahas. Remember: Kheda and Ahmedabad both occurred before the Rowlatt Satyagraha (1919), and the Salt March (Dandi, 1930) came last during the Civil Disobedience Movement. The source passage confirms Rowlatt Satyagraha was in 1919; the other dates must be recalled from the chapter narrative.