_____, an Indian patriot from Punjab, shot down General Reginald Dyer in London.

Sardar Udham Singh

The correct answer is Option 3- Sardar Udham Singh

Udham Singh, an Indian patriot from Punjab, shot down General Reginald Dyer in London.

Udham Singh assassinated General Dyer in 1940 in retaliation for the Jallianwala Bagh massacre of 1919. where General Dyer ordered the killing of hundreds of unarmed Indian civilians in Amritsar, Punjab.