The correct option is "1 and 2 only" because the Rowlatt Act, enacted in 1919, was indeed based on the recommendations of the Sedition Committee, which emphasized suppressing unrest in India following World War I. In the Rowlatt Satyagraha, Mahatma Gandhi sought to mobilize public opinion and utilized organizations like the Home Rule League to amplify nationalist sentiments and opposition to repressive legislation. However, the demonstrations against the Simon Commission, which took place in 1928, occurred after the Rowlatt Satyagraha and thus do not coincide chronologically. This analysis illustrates the interconnectedness of events in the Indian independence movement, as well as Gandhi's strategic use of existing nationalist organizations to foster resistance against colonial repression.