Why did a conflict develop between Serbia and Austria-Hungary in the years leading up to World War I?
A. Serbians believed that Austro-Hungarian lands with large Serb
populations should join Serbia,
B. Austro-Hungarians began a campaign of genocide against Serbs
in their territory
O C. Serbian military forces joined the Ottoman Empire in its attacks
against Austria-Hungary.
D. Austro-Hungarian nationalists assassinated the leader of Serbia's
ruling political party.

A. Serbians believed that Austro-Hungarian lands with large Serb

populations should join Serbia,

Explanation:

The Serbians who were trapped in Austria-Hungary believed that they should have all the land of Austria-Hungary and give it to Serbia, so that they would have more land, and more natural resources.

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