KareyGroves
Answered

During the rise of the nation-state in Europe, what was necessary for nationalism to thrive?

Aa common identity and a formal structure of authority
Ba strong military and a decentralized government
Ca parliamentary government and a common language
Da shared culture and a powerful middle class

Verified Answer :

"a. a common identity and a formal structure of authority" is the best option, since nationalism was mostly about national pride--meaning that one was tied to their countrymen through a common bond.