How can be the assassination of the Archduke Ferdinand be described?

A. It ended the war
B. It is the cause of the war
C. It is the last event before the war starts
D. All of the Above.

C. It is the last event before the war starts

Explanation: Archduke Franz Ferdinand was assassinated on June 28, 1914, and exactly a month later,  World War 1 began. Many events, however, preceded the Archduke's death, for example German unification, the Berlin Conference, and Austria's claiming of Bosnia. Therefore, the assassination of the Archduke was simply a catalyst to the war.

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