Answer:
(C) assassination of Archduke Ferdinand
Explanation:
The Sarajevo attack is the term with which the murder is known, on June 28, 1914, of the crown heir of the Austro-Hungarian Empire, Archduke Franz Ferdinand of Austria, and his wife, Duchess Sofia Chotek, in Sarajevo, capital of the imperial province of Bosnia and Herzegovina. The attack was perpetrated by Gavrilo Princip, a member of the Young Bosnia group, a movement whose objective was the emancipation of Bosnia from Austria-Hungary, which was supported by intelligence and military circles from the Kingdom of Serbia.
The assassination of Archduke Francisco Fernando shocked all of Europe and caused a climate of international sympathy for the Austrian position. Austria-Hungary declared war on Serbia on July 28, 1914, and mobilized the part of its army that was going to face the already mobilized Serbian army. In terms of the Franco-Russian alliance, Russia and France would also be forced to mobilize their armies. Soon, all the great powers, except for Italy and Great Britain, which would take a few more months to get involved, had chosen their allies for the conflict, which would go down in history as the First World War.
