The Non-Cooperation Movement: ● It was launched by Mahatma Gandhi on August 1, 1920. ● It was the first mass movement organized nationwide during India's struggle for freedom. ● Causes: . → Jallianwala Bagh Massacre and Punjab Disturbances. → Dissatisfaction with Montagu-Chelmsford Reforms. → Rowlatt Act. → Khilafat Agitation. So, all the statements are correct. ● The above-mentioned causes resulted in unrest among the masses anxious to take political action against the British government. ● The economic hardship suffered by ordinary Indians added fuel to the fire. ● Congress session in Nagpur in December 1920 defined the Non - Cooperation movement.