Correct Option: A

The Rowlatt Act was passed by the Imperial Legislative Council in London on 10 March, 1919, indefinitely extending "emergency measures" (of the Defence of India Regulations Act) enacted during the First World War in order to control public unrest and root out conspiracy. This Act effectively authorized the government to imprison for a maximum period of two years, without trial, any person suspected of terrorism living in the Raj and gave British imperial authorities power to deal with revolutionary activities.