Answer: A.
Explanation: The wealth of the nation was due to trade into its military strength. At the same time western Roman cities began to crumble while Constantinople remained stable.
I hope this is the right answer your looking for!
<span>The Schlieffen Plan’s objective was to
launch an attack on France so that they can take the French out and this would
force Russia to accept their terms. The
problem was that was poorly organized and this led Britain to get involved in
the conflict that started World War I.</span>