Explanation:

- Bhagat Singh, Rajguru, and Sukhdev were hanged on March 23, 1931, for their involvement in the Lahore Conspiracy Case. They were part of India's struggle for independence and are remembered as martyrs.

- Option 1 (1930): This is not the correct year. They were arrested in 1929 and were still undergoing trial during 1930.

- Option 2 (1935): By this year, the trio had already been executed. It is four years after their actual execution.

- Option 3 (1933): This is also incorrect as they were executed two years earlier.

- Option 4 (1931): This is the correct answer, marking the actual year of their execution.

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