Answer:
C) The policy of establishing strong trade ties with the Yuan dynasty to deter a conquering force.
Explanation:
Mongols use to rule by power. They were physically strong and had gained empire through brutality. Mongols wanted to rule Vietnam but they also wanted to increase trade stability. For this purpose Mongols decided to rule with peace. They had to change their nature and promoted peace during Pax Mongolica to flourish trade.
B. More people move out than in
In my opinion, it wasn’t fair. It blamed the entire war only on Germany, which caused them to have a severe economic depression and crumbled their entire nation. This is one of the reasons why Germany started WW2. Germany also wasn’t the only nation that completely started WW1, it started when a Serbian terrorist group assassinated the Archduke of Austria- Hungary.