What resulted from Austria-Hungary’s annexation of Bosnia and Herzegovina is an increase in the nationalism of Slavic people
In the year 1908, the annexation of Bosnia & Herzegovina by Austria-Hungary led to a controversy between the Dual Monarchy and Turkey.
The annexation also led to international complications which for several weeks early in 1909 threatened to end in a general European war as well as upsetting the fragile balance of power in the Balkans, enraging Serbia and pan-Slavic nationalists throughout Europe.
Also, the Pan-Slavic nationalism contribute to World War 1 as the Pan-Slavic movement in Eastern Europe in the early 20th Century created a tension between Austria-Hungary and Serbia that culminated in WWI. This tension was caused by the threat Pan-Slavism posed on Austria-Hungary due to its high Slavic population and its recent annexation of Bosnia Herzegovina.
Therefore, the Option A is correct.
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