I believe it is A.) The seperation of church and state.
Answer:
Rome and 395 AD
Explanation:
Those are it im pretty sure!
I believe the correct answer is B, correct me if im wrong
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. When Russia began to mobilize due to its alliance with Serbia, Germany declared war on Russia.
France wanted colonies in Asia but they couldn't get China and India was under British control. So they decided to focus on Indochina, mainly Vietnam, since it was a country that could be very profitable.