The answer is D. A set of diary entries written by generals who planned strategies during world war II. This is a primary source which was written during that time period and so would be the best support for the authors' argument..
Nicholas II or Nikolai II (Russian: Николай II Алекса́ндрович, tr. Nikolai II Aleksandrovich; 18 May [O.S. 6 May] 1868 – 17 July 1918), known as Saint Nicholas the Passion-Bearer in the Russian Orthodox Church, was the last Emperor of Russia, ruling from 1 November 1894 until his forced abdication on 15 March 1917.
I think so because free trade
After the Qin Dynasty collapsed in 207 BC after four years of civil war, Liu Bang established the Western Han Dynasty
