Statement 1 is correct: A committee named the 'Sedition Committee' was set up in 1918 by the British Raj, led by Sir Sidney Rowlatt, a British judge. The purpose of this committee was to investigate political activities considered seditious by the British government, particularly in Bengal and Punjab. Statement 2 is correct: Gandhi believed the Rowlatt Act, passed based on the committee's recommendations, was unjust. It gave the British authorities broad powers to arrest and detain people suspected of revolutionary activities without trial. While not the primary tool used by Gandhi, Gandhi did attempt to leverage the support and networks of the Home Rule Leagues to mobilize people against the Rowlatt Act. Statement 3 is incorrect: Demonstration against the Simon Commission was held in 1928, while the Rowlatt Act was passed in 1919.