The Chauri-Chaura incident in the United Provinces (now Uttar Pradesh) occurred in February 1922 for the following reason:

Background: The incident took place during the Non-Cooperation Movement led by Mahatma Gandhi. This movement aimed to peacefully resist British colonial rule and the oppressive Rowlatt Act.

Protest: On February 5, 1922, a large group of protesters gathered in the town of Chauri-Chaura in the Gorakhpur district of the United Provinces. The protesters were demanding the release of their fellow non-cooperation activists who had been arrested.

Violence: The situation turned violent when the protesters clashed with the police. In the course of the clash, the protesters set fire to a police station, leading to the death of many police officers.

Gandhi's Response: Mahatma Gandhi was deeply distressed by the violence and loss of life in Chauri-Chaura. He felt that the movement was losing its non-violent character. In response to the incident, he called off the Non-Cooperation Movement on February 12, 1922.

So, the correct option is [1].