Question

Which of the following did technological advancement during World War I did NOT help end trench warfare *
1.machine gun
2.artillery
3.tanks
4.poison gas

Answer 1

Potion gas , it better help

Answer 2

Use of tanks is known to be one of the key reasons why trench warfare ended, along with artillery and machine guns being key to defending the trenches.

This leaves poison gas as the technological advancement that did NOT help end trench warfare. 

Hope I could help!