The Correct Answer is "C".
Nationalism is a political, social, and economic ideology which promotes the interest of that particular nation in order to secure sovereignty and eradication of foreign interference. Nationalism led to the first movements which occurred in Serbia against the influence of the Austro-Hungarian Empire. These revolts eventually led to the death of Archduke Franz Ferdinand II (Ruler of the Austro Hungarian Empire) in Sarajevo. This was the opening event in the war, as Austro Hungary would attack Serbia after this incident.
Although the Ottoman Empire sided with Austro Hungary during the war, it was the former kingdom which led the war. Therefore attention was not particularly focused on them during the conflict.
The role of nationalism did not unite Europe against the Ottoman Empire in causing the First World War.
Nationalism is a way of thinking which says that some groups of people, especially ethnic groups, are free to rule themselves. It is also a political, social, and economic ideology that promotes the interest of particular nations.
Nationalism was the main cause of the first world war. It influences the Austro- Hungarian empire against Serbia. Nationalism inspired the assassination of prince Ferdinand in Sarajevo in July 1914. This incident laid the foundation of the first world war.
Therefore the correct option is C.
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