C) populism
For future reference: an easy way to remember the causes is to use the acronym MAIN (as in the MAIN causes) to remember that they are militarism, alliances, imperialism, and nationalism.
Hope this helps :)
"The name code talkers is strongly associated with bilingual Navajo speakers specially recruited during World War II by the US Marine Corps to serve in their standard communications units of the Pacific theater. Code talking, however, was pioneered by the Cherokee and Choctaw peoples during World War I.
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They sent and received verbally encrypted messages over radio to and from the battlefield during World War 1.
Class conflict (: I've already have learned about this.
The weakness of the Byzantine Empire was a major contributor to the expansion of Ottoman rule. Another reason for the success of the Ottomans is tied to religion. The subjects of the Ottoman Empire were devout Muslims and they believed they were on a mission to expand Islam.