Answer:
None really "resulted in trench warfare" Read explanation...
Step-by-step explanation:
None of those really “resulted” in trench warfare. They all played a significant role though. Machine guns were good for taking out large numbers of charging troops quickly. This caused trench warfare to be kind of useless. Anyone who tried to run into the enemy trench would just get mowed down my enemy machine guns. This is where tanks played a big role. Tanks were bullet proof and could drive over trenches, the barbed wire, and the holes in the ground. Airplanes could fly overhead and watch the enemy movement from the air. They could even bomb enemy trenches. Overall, tanks, planes, and machine guns all were significant in the war.