The correct option is
C A-
4, B-
3, C-
2, D-
1A. Publication of the Simon-Commission Report - June 7, 1930. In 1930, the Commission published its two-volume report, also known as the Simon Report. The Simon Commission was formed in 1927 to review the the Government of India Act 1919. The Commission, appointed by Prime Minister Stanley Baldwin, did not include any Indian delegates.
B. First Round Table Conference inaugurated - November 12, 1930. he Round Table Conference officially inaugurated by His Majesty George V on November 12, 1930 in Royal Gallery House of Lords at London.
C. Singing of the Gandhi-Irwin Pact - March 5, 1931. On March 5, 1931 before the second Round Table Conference in London, on March 5, 1931 before the second Round Table Conference in London signed the Gandhi–Irwin Pact. This was a political agreement.
D. Execution of Bhagat Singh, Sukh Dev and Raj Guru - March 23, 1931. On March 23, 1931, Bhagat Singh along with his associates Sukhdev Thapar and Shivaram Rajguru were hanged to death for the assassination of 21-year-old British police officer John Saunders. The day they were executed is celebrated as Martyrs' Day throughout the country.