Answer:
The correct answer according to research done on the types of warfare that were used during World War I, but which was not new, is, B: Trench warfare.
Explanation:
Historically speaking, the use of trenches as a form of warfare has been as old as Rome itself. From the time of the Roman legions, building trenches to protect armies from the attacks of superior weapons, and power, from the enemy, was almost common. However, it was never more used than during the First World War, especially in the Western Front. This style of warfare became so useful during this war, that at times it made it seem as if the battles fought would never be won be anyone, as all sides literally fought from their borrows and trenches. The effects, and consequences of this type of warfare were so severe, that there is a lot of research done on it, and whole books that talk about how life was for the men who had to literally live on these places of death.
