What is one example of trench warfare?

A) An army fires machine guns at the enemy in the open

B) An army bigs a long haul and we plan to protect territory

C) An army drop the bombs from the air to defeat the enemy

D) An army uses tanks to conquer an enemy city

B. because a trench warfare is where troops are protected from the enemys fire and defend their place.

Hello! Your answer is A.

Trench warfare is a fighting style that was created during WWI to combat the new invention of machine guns which could mow down hundreds to thousands of men easily within seconds. By creating deep trenches, they were able to not be hit by the bullets that were above while still attacking. Enemies often used trenches themselves to protect themselves from the other sides machine guns.