Concept: The Dandi March, also called the Salt Satyagraha, was a peaceful protest against the British salt tax. It began on a specific date in 1930. Explanation: Gandhi announced the plan on 5 February 1930. He chose to start the march on 12 March 1930 from Sabarmati Ashram. He walked with 80 followers to Dandi, Gujarat, covering 390 km. The march ended on 6 April 1930 with breaking the salt law. This event sparked mass civil disobedience. Millions made illegal salt or bought it. The British arrested over 60,000 people by the end of March. The Dandi March is a key event in India's freedom struggle. Answer: B. March 12, 1930