Answer:
C)patriotism
Step-by-step explanation:
Nationalism increased competition for power among Europeans fueled by feelings of belonging to a single and unified nation-state: patriotism
The nationalism became mostly patriotic when countries like England and Germany openly claimed to be superior.
Nationalism had been so strong that radical movements spread through different regions of the former Ottoman Empire. The Russians to their side were promoting Pan Slavism (which wanted unification of all Slavic peoples)
When Archduke Franz Ferdinand was assassinated, countries were willing to fight for their allies and rather than negotiating they solved to arms.
The feelings of belonging to a country and giving the life for the sake of the state where meant in the years preceding the World War as major sources of the tensions between Europeans.