The correct answer is: C. 1921
The Swarajist Movement was a political movement in India that began in 1920. The movement was led by C.R. Das and Motilal Nehru, and its goal was to achieve self-rule for India within the British Empire. The Swarajists won a majority of seats in the Legislative Assembly of Bihar in 1920, and they used their power to pass a number of reforms, including the introduction of free primary education and the establishment of a system of local self-government. The Swarajist Movement was a major turning point in the history of India, and it helped to pave the way for the country’s independence in 1947.
Option A is incorrect because the Swarajist Movement did not start in 1920. The movement actually began in 1921.
Option B is incorrect because the Swarajist Movement did not start in 1922. The movement actually began in 1921.
Option D is incorrect because the Swarajist Movement did not start in 1923. The movement actually began in 1921.