Answer: The stong nationalism of the Serbians.
Explanation: The Serbians were against plans of Austria-Hungary to colonize their land.
Answer:
The main reason why Christianity spread in the Byzantine Empire is that decades prior to the emergence of the Empire, Roman Emperor Constantine made Christianity the official religion of the Roman Empire, with they Edict of Milan, which he decreed in 313 AD.
We must remember that the Byzantine Empire is simply the Eastern Roman Empire, and when the Middle Ages started, the Byzantine Empire held land that had been christianizing for a over a century. Only a few areas of the Empire had to christianized in the Middle Ages, essentially areas at the edges of the Empire.
The correct answer is D. Baron de Montesquieu.
Explanation
Charles Louis de Secondat, lord of la Brède and baron de Montesquieu (1689 - 1755) was a French philosopher who stood out for his ideas related to the intellectual and cultural movement of the Enlightenment. His works focused on the theory of separation of powers, which has been introduced in many constitutions around the world. His most famous work on the division of powers was his treatise "On the Spirit of the Laws" in which he states that in antiquity the functions of the State (necessary for the protection of the citizen) were monopolized in a single entity, which usually associates with despotism. Therefore, he proposes to distribute public powers among different entities, which limit each other, avoiding the monopolization of power in a single person or entity. So, the correct answer is D. Baron de Montesquieu.