The correct option is B 13 April 1919
The Jallianwala Bagh massacre took place on 13 April 1919 when troops of the British Indian Army under the command of General Dyer fired rifles into a crowd of Baisakhi pilgrims, who had gathered in Jallianwala Bagh, Amritsar, Punjab. The government of India ordered an investigation of the incident (the Hunter Commission), which in 1920 censured Dyer for his actions and ordered him to resign from the military. Reaction in Britain to the massacre was mixed, however.