What part do you need help with?
I agree with the other person - the correct answer should be <span> A. The difficulty of running such a large territory.
The Roman Empire was huge - it had many territories in Europe, North Africa, and the Middle East, so it encompassed such a large area that it was too difficult to govern smoothly. This is why it was split into two areas so as to make things easier.
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Answer: The stong nationalism of the Serbians.
Explanation: The Serbians were against plans of Austria-Hungary to colonize their land.
To be honest. This is why the civil war happened. Some people may have lived in the free states, but Most people fought for their beliefs. Hope I helped.