(A) 1911
(B) ** 1914
(C) 1918
(D) 1923
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: -At the dawn of the 20th century, few anticipated a global war, but what came to be known as the Great War began on June 28, 1914, with the assassinations of Austrian Archduke Franz Ferdinand and his wife, Sophie, while they were visiting Sarajevo, Bosnia, a country recently annexed into the Austrian Empire.
Concept note-3: -The assassination of Austrian Archduke Franz Ferdinand on 28 June 1914 set off a chain of events that led to war in early August 1914. The assassination was traced to a Serbian extremist group that wanted to increase Serbian power in the Balkans by breaking up the Austro-Hungarian Empire.
Concept note-4: -Austria-Hungary, with German encouragement, declared war on Serbia on 28 July. Russia’s support of Serbia brought France into the conflict. Germany declared war on Russia on 1 August and France on 3 August.