Correct Answer: On 13 April 1919, at Amritsar

Solution : The correct option is On 13 April 1919, at Amritsar.

On 13 April 1919, the Jallianwala Bagh massacre occurred in Amritsar, Punjab. It happened at Jallianwala Bagh, a public area surrounded by walls on all sides and with just one small entry. The British commander in command, Brigadier General Reginald Dyer, came with a group of fifty soldiers and, without warning, ordered his troops to begin fire on the unarmed public. The gunfire lasted for ten minutes before they ran out of ammunition.