The Non-cooperation Movement was called off due to

Correct answer: Chauri Chaura Incident

Explanation: The correct answer is B. Chauri Chaura Incident. The Non-Cooperation Movement (1920-1922) was a mass movement led by Mahatma Gandhi against British rule in India. It involved boycott of British goods, titles, schools, courts, and a push for self-rule through non-violent means (Satyagraha). However, the movement was suddenly called off by Gandhi after the Chauri Chaura incident in February 1922. In this incident, a violent mob of protesters clashed with the police in Chauri Chaura, a town in Uttar Pradesh, and set a police station on fire, resulting in the death of 22 policemen.