Answer:
<em>From what I know, it is B.</em>
Explanation: Hope this helps..
Increased tensions between the countries and development of many dangerous weapons.
Ans: Nationalism lead people to conflict. Archduke Franz Ferdinand was assassinated due nationalism by the Black Hand, a nationalist group that intended to liberate the Serbs from the Austro-Hungarian occupation. The death of Franz Ferdinand was one of the most important factos to cause the World War I.
