The correct answer is option 3, Chauri Chaura. The Non-Cooperation movement, led by Mahatma Gandhi, was a significant phase in India`s struggle for independence against British colonial rule. It aimed to protest against British injustice and exploitation through nonviolent means.

In 1922, during the Non-Cooperation movement, a violent incident took place in Chauri Chaura, a village in Uttar Pradesh. A large group of protestors attacked and set fire to a police station, resulting in the death of 22 police officers. This act of violence went against Gandhi`s principle of nonviolence, which was the cornerstone of the Non-Cooperation movement.

Upon hearing about the incident, Mahatma Gandhi was deeply saddened and shocked. He believed that the protestors had deviated from the path of nonviolence and the movement had lost its moral foundation. Consequently, Gandhi called off the Non-Cooperation movement as a form of protest disciplinary action. He believed that the movement should not continue if violence was being used. This decision was made in February 1922, and it marked a significant turning point in India`s struggle for independence.

Therefore, Chauri Chaura`s events led to the calling off of the Non-Cooperation movement due to the deviation from