(A) Each side cut off the fuel supply of the other.
(B) Germany’s military tactics were based on static warfare.
(C) There is only a small amount of flat land in all of Europe.
(D) ** The armies became immobile because of trench warfare.
EXPLANATIONS BELOW
Concept note-1: -Why did most of the combat on the Western Front in World War I take place in aa relatively small area? The armies became immobile because of trench warfare.
Concept note-2: -Trenches provided a very efficient way for soldiers to protect themselves against heavy firepower and within four months, soldiers on all fronts had begun digging trenches.
Concept note-3: -The First World War is often perceived as a war of attrition, a conflict in which each side tried to wear the other down by killing as many of its men as possible.
Concept note-4: -The majority of the fighting took place in Europe along two fronts: the western front and the eastern front. The western front was a long line of trenches that ran from the coast of Belgium to Switzerland. A lot of the fighting along this front took place in France and Belgium.