The correct answer is S → R → P → Q. Explanation & Key Takeaways: • Champaran Satyagraha 1917: • The issue was Indigo Cultivation under the Tinkathia System (3/20)th of total land). • Gandhi convinced the authorities to end the system • Demand was accepted and 25% compensation was given. • It was the first Satyagraha, taken up by Gandhiji in India. • Joining peasant unrest to India's National Movement is a very significant aspect of the Champaran Satyagraha. • GoI Act 1919: • This act is also known as the Montague-Chelmsford Reforms. • It was passed to expand the involvement of Indians in India's government. • The Act provided the main provinces with a dual form of government ("diarchy"). • Diarchy means a dual set of governments; one is responsible, the other is not liable. • The Act also required that the three (other than Commander-in-Chief) of the six members of the Executive Council of the Viceroy be Indians. • The Simon Commission 1928: • It was a group of seven British Members of Parliament of the United Kingdom that came to India in 1928 to study constitutional reform. • The people of India were outraged, as the Simon Commission, which was to determine the future of India, did not include a single Indian member in it. • The people of India agitated against the arrival of the Simon Commission because there was no Indian member in the Simon Commission. • Lahore Session 1929: • The Purna Swaraj declaration is also known as the Declaration of the Independence of India. • It was promulgated by the Indian National Congress at the Lahore session under the influence of Jawaharlal Nehru in 1929. • The purpose of the declaration was to fight for complete self-rule or Purna Swaraj, independent of British rule. • At that declaration flag of India was hoisted by Gandhi on 31 December 1929, in Lahore. • The resolution was passed at that declaration to observe 26 January as Independence Day. • The flag of India was unfurled publicly across India.