The answer is A they <span>perform scientific experiments to test it.</span>
The war pitted the Central Powers (mainly Germany, Austria-Hungary, and Turkey) against the Allies (mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States).
Participants: Bulgaria France Germany Italy Japan Ottoman Empire Portugal Russia ...
Date: July 28, 1914 - November 11, 1918
Major Events: Gallipoli Campaign First Battle of the Somme Battle of Verdun Christm...
Decreasing nationalism is the answer.
