Explanation:

1st option is correct.
Mahatma Gandhi sat on to fast unto death in 1932 because of separate electorate for the depressed classes.
On this day in 1932, in his cell at Yerovda Jail near Bombay, Mohandas Karamchand Gandhi begins a hunger strike in protest of the British government’s decision to separate India’s electoral system by caste.
A leader in the Indian campaign for home rule, Gandhi worked all his life to spread his own brand of passive resistance across India and the world. By 1920, his concept of Satyagraha (or “insistence upon truth”) had made Gandhi an enormously influential figure for millions of followers. Jailed by the British government from 1922-24, he withdrew from political action for a time during the 1920s but in 1930 returned with a new civil disobedience campaign. This landed Gandhi in prison again, but only briefly, as the British made concessions to his demands and invited him to represent the Indian National Congress Party at a round-table conference in London.