Explanation:

• Rowlatt Acts, (February 1919), legislation passed by the Imperial Legislative Council, the legislature of British India. The acts allowed certain political cases to be tried without juries and permitted internment of suspects without trial. Their object was to replace the repressive provisions of the wartime Defence of India Act (1915) by a permanent law.
• Jallianwala Bagh is a historic garden and 'memorial of national importance' in Amritsar, India, preserved in the memory of those wounded and killed in the Jallianwala Bagh Massacre that occurred on the site on the festival of Vaisakhi, 13 April 1919.
• After the terrible massacre at Jallianwala Bagh on 13th April, 1919, the Legislative Council of the government of India constituted the Hunter Commission to examine the mishap that occurred there. On that fateful day, at least a thousand people including women, children and the elderly died and another 1500 were injured, on the orders of General Dyer. The investigating committee was led by Lord William Hunter. The commission was formed on 29th October 1919. It convened in November and took testimony over a period of 46 days.