The correct answer is Salt tax Explanation & Key Takeaways: • The Dandi March, also known as the Salt March, was a non-violent protest against the British monopoly on salt and the heavy salt tax imposed on Indians. • Beginning on March 12, 1930, Gandhi and his followers marched from Sabarmati Ashram to the coastal village of Dandi in Gujarat, covering approximately 240 miles over 24 days. • Upon reaching Dandi on April 6, 1930, Gandhi symbolically made salt from seawater, defying British law and sparking a widespread civil disobedience movement across India. • The protest against the salt tax highlighted the unjust and oppressive policies of British rule and became a turning point in the Indian independence movement. Related Concepts: • Indigo Cultivation • Indigo cultivation was forced upon Indian farmers under British rule, especially in Bengal and Bihar, to meet the high demand for indigo dye in Europe. • The exploitative system led to the Indigo Rebellion (1859–1860) and later influenced movements like the Champaran Satyagraha in 1917, where Gandhi supported farmers against the oppressive indigo cultivation practices enforced by British planters. • Textile Trade Regulations • The British imposed trade regulations and heavy duties on Indian textiles while promoting British-made textiles in India. • This led to the decline of India’s traditional textile industry, particularly handloom and Khadi. • In response, the Swadeshi Movement (1905) encouraged Indians to boycott British goods, especially textiles, and promoted the use of Indian-made products, including Khadi, to revive the local industry. • Land Revenue • The British introduced various exploitative land revenue systems like the Permanent Settlement, Ryotwari, and Mahalwari systems, which led to excessive taxation and poverty among Indian farmers. • Resistance to these policies included the Bardoli Satyagraha (1928) led by Sardar Vallabhbhai Patel and other regional revolts where farmers protested against unfair land taxes and evictions.