The correct answer is option 4, Sabarmati Ashram. Mahatma Gandhi started his Dandi March from Sabarmati Ashram. The Dandi March, also known as the Salt March, was a nonviolent protest organized by Gandhi against the British salt monopoly in India. It began on March 12, 1930, and lasted for 24 days. Gandhi, along with 78 voluntary followers, walked a distance of approximately 240 miles from Sabarmati Ashram to the coastal village of Dandi in Gujarat. The goal of the march was to produce salt by collecting seawater and evaporating it, defying the British salt laws. The Dandi March played a significant role in the Indian independence movement and Gandhi`s philosophy of nonviolent resistance.