As much as C. has a partiality towards the cause of The Great War, it's most likely answer B.
The Germans declared war on the Russian Empire, guaranteed the independence of Serbia, because of their alliance backing Austria, and Serbia which the Austrians declared war on as a result of the Serbian citizen who shot the heir to the throne.
The rest of Europe's involvement was a chain reaction of countries coming to the aid of another. France with defending Russia, Britain defending Belgium, etc.
Federalism is a mix or compound mode of government that combines a general government with regional governments in a single political system is distinctive feature first embodied in the constitution of the United States of 1789, it’s a relationship of parity between the two levels of government established a can thirst be defined as a form of government in which powers are divided between two levels of government of equal status
End of French and indian war
