(A) MIlitarism
(B) Alliances
(C) Nationalism
(D) ** The assassination of Archduke Francis Ferdinand
EXPLANATIONS BELOW
Concept note-1: -The assassination of Archduke Franz Ferdinand was the immediate cause of a war between two great powers-Russia and the Habsburg Austro-Hungarian Empire.
Concept note-2: -When it was learned that the heir-apparent to the Austrian throne, Franz Ferdinand, was scheduled to visit Sarajevo in June of 1914, the Black Hand decided to assassinate him because of his perceived threat to Serbian independence.
Concept note-3: -Causes of World War I. It is widely believed that the assassination of Archduke Franz Ferdinand and his wife during a visit to Serbia is the spark that ignited the conflict of World War I.
Concept note-4: -The political objective of the assassination was to free Bosnia and Herzegovina of Austria-Hungarian rule and establish a common South Slav ("Yugoslav") state. The assassination precipitated the July Crisis which led to Austria-Hungary declaring war on Serbia and the start of World War I.