The correct answer is Calcutta session in September 1920. At Calcutta's session of the Congress in September 1920. Gandhi Ji Convinced other leaders of the need to start a non-cooperation movement in support of Khilafat as well as for swaraj. To defend the Khilafa's temporal powers, a khilafat committee was formed in Bombay in March 1919. At that time young generation of Muslim leaders like the brothers Muhammad Ali and Shaukat Ali. Additional InformationNon-Cooperation Movement was a significant phase of the Indian independence movement from British rule. It was led by Mahatama Gandhi after the Jallianwala Bagh Massacre. It aimed to resist British rule in India through nonviolent means.