(A) 1861-1865
(B) ** 1914-1918
(C) 1917-1918
(D) 1914-2000
EXPLANATIONS BELOW
Concept note-1: -World War I began after the assassination of Austrian archduke Franz Ferdinand by South Slav nationalist Gavrilo Princip on June 28, 1914. Read more about why the Balkans became the “powder keg of Europe.”
Concept note-2: -For four years, from 1914 to 1918, World War I raged across Europe’s western and eastern fronts, after growing tensions and then the assassination of Archduke Franz Ferdinand of Austria ignited the war.
Concept note-3: -On Nov. 11, 1918, after more than four years of horrific fighting and the loss of millions of lives, the guns on the Western Front fell silent.
Concept note-4: -In just four years between 1914 and 1918, World War I changed the face of modern warfare, becoming one of the deadliest conflicts in world history.