The correct answer is Option3, i.e 6 April 1930. ● On 2 March 1930, Gandhiji informed the viceroy through a letter about his plan of action of marching to the coast of Dandi to violate the salt law, and the course of Civil Disobedience. ●The march began on12 March 1930 with 78 members of Sabarmati Ashram. ∘They walked for about 240 miles and reached the coast of Dandi on 6 April 1930. ∘Gandhiji made salt from sea water and violated the salt law.