The correct option is B The people became violent at Chauri-Chaura
A mob of people at Chauri – Chaura (near Gorakhpur) clashed with police and burnt 22 policemen on February 5, 1922. This compelled Gandhiji to withdraw the Non-Cooperation movement on Feb. 12, 1922. Gandhiji had to stop his Non-co-operation movement because the people became violent at Chauri-Chaura.