Explanation:

The Salt March, also known as the Salt Satyagraha, Dandi March and the Dandi Satyagraha, was an act of nonviolent civil disobedience in colonial India led by Mohandas Karamchand Gandhi.
Chauri Chaura is a town near Gorakhpur, Uttar Pradesh, India, located on the State Highway between Gorakhpur and Deoria, 30.5 kilometres. from Gorakhpur. It has a railway station which is 25 km. south-east of the Gorakhpur Junction.
The Simon Commission was a group of 7 MPs from Britain who was sent to India in 1928 to study constitutional reforms and make recommendations to the government. The Commission was originally named the Indian Statutory Commission. It came to be known as the Simon Commission after its chairman Sir John Simon.
The Indian Councils Act 1909 or Morley-Minto Reforms or Minto-Morley Reforms was passed by British Parliament in 1909 in an attempt to widen the scope of legislative councils, placate the demands of moderates in Indian National Congress and to increase the participation of Indians the governance.