Correct Answer: (b) 4th February, 1922
Solution:The Chauri-Chaura incident occurred at Chauri-Chaura in the Gorakhpur district of the then United Province, British India on 4 February 1922. When a large group of protesters participating in the Non-Cooperation Movement turned violent, they attacked and set fire to a police station, killing all its occupants. This led to the deaths of three civilians and 23 policemen.