The correct option is B Rowlatt Act allowed detention of political prisoners for a period of 5 years without trial.
Rowlatt Act was passed in 1919 by the Imperial Legislative Council, the legislature of British India. This Act had been hurriedly passed through the Imperial Legislative Council despite the united opposition of the Indian members. It gave the government enormous powers to repress political activities and allowed detention of political prisoners without trial for two years. In response to this, Mahatma Gandhi decided to launch a nationwide satyagraha against the proposed Rowlatt Act (1919).