Correct Option: A

The first mass movement started by Mahatma Gandhi was Non-cooperation Movement. Mahatma Gandhi announced his plan to begin Non-Cooperation with the government as a sequel to the Rowlatt Act, Jallianwala Bagh massacre and the Khilafat Movement. It was approved by the Indian National Congress at the Nagpur session in December, 1920. The movement began with Mahatma Gandhi renouncing the titles, which were given by the British. Other leaders and influential persons also followed him by surrendering their honorary posts and titles. Students came out of the government educational institutions. National schools such as the Kashi Vidyapeeth, the Bihar Vidyapeeth and the Jamia Millia Islamia were set up. All the prominent leaders of the country gave up their lucrative legal practice. Legislatures were boycotted. No leader of the Congress came forward to contest the elections for the Legislatures.