Explanation:

4th option is correct.
With reference to the period of Indian Freedom Struggle, Indian Statutory Commission is popularly known as Simon Commission.
The Indian Statutory Commission was a group of seven British Members of Parliament of United Kingdom under the chairmanship of Sir John Simon assisted by Clement Attlee. The commission arrived in British-occupied India in 1928 to study constitutional reform in Britain's most important colonial dependency. It was commonly referred to as the Simon Commission after its chairman, Sir John Allsebrook Simon.