How did life western europe deteriorate compared to life in the byzantine empire after the fall of the roman empire?

The Byzantine Empire and Western Europe originally were part of the Roman Empire, but by the Middle Ages, they were vastly different, though they shared common traits, but by the 300's, the Byzantine Empire had far surpassed Western Europe in trade and economics and political unity, while both empires were having arguments over religion.

> Hope this helps a little bit (:

the answer is a) the proclamation of 1763.

d.)   when the us left nato after the end of the cold war and they had to evolve to focus on more humanitarian measures with the smaller budget