Confusion PointsSince this question was null and void in the original exam due to no option being correct, we have changed the option.The correct option is 1930.Explanation: Dandi March:In the year 1930, before India became independent there was a law called Salt Law.For many years the British had made the law that did not allow people to make salt themselves.They had also put a heavy tax on salt.By this law, people could not make salt even for use at home.Gandhiji, with several other people, went on a yatra (long walk) from Ahmedabad to the Dandi seashore in Gujarat, to protest against this law.The march lasted from March 12th, 1930 to April 6th, 1930.The march was aimed as a direct action campaign of tax resistance and nonviolent protest against the British salt monopoly.The yatra covered 390 kilometres from Dandi to Sabarmati Ashram.Thus, Gandhiji, with several other people, went on a yatra from Ahmedabad to the Dandi seashore in Gujarat, to protest against a law in the year 1930.Additional InformationMaking of Salt:Evaporation is used as the process of separation of salt and water. Commercially this is done by keeping water in small lagoons.Water is exposed to sunlight in these lagoons. Water is evaporated and salt is left behind in lagoons.