(A) North America
(B) Africa
(C) Asia
(D) ** Europe
EXPLANATIONS BELOW
Concept note-1: -World War I (WWI or WW1), also called the First World War, began on July 28, 1914 and lasted until November 11, 1918. It was a global war and lasted exactly 4 years, 3 months and 2 weeks. Most of the fighting was in continental Europe.
Concept note-2: -Most of the combat in the First World War took place in Europe, along three fronts: 1) the Italian border with the Austro-Hungarian Empire and the Balkans in the south, 2) the Eastern Front along the Russian border in the east, and 3) the Western Front in France and Belgium.
Concept note-3: -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.
Concept note-4: -Britain and its Empire’s entry into the war made this a truly global conflict fought on a geographical scale never seen before. Fighting occurred not only on the Western Front, but in eastern and southeast Europe, Africa and the Middle East.
Concept note-5: -World War I, also called First World War or Great War, an international conflict that in 1914–18 embroiled most of the nations of Europe along with Russia, the United States, the Middle East, and other regions.