01 What did Balkan nationalist groups use to strengthen their claims?
Answer and explanation
Correct answer: A. History and ethnic identity
Explanation: The governing concept is nationalism: a group presents a shared identity as the basis for political rights and independence. Balkan nationalist groups referred to a common or remembered history, language, culture, and ethnic identity to show that they formed distinct communities. Therefore option A is correct. Climate, trade prices, and sports competitions do not normally establish a national claim or justify territorial independence.