The answer is: B.drained their economic resources
During its military build-up, soviet union allocate most of their government budget to military and they also require the manufacturers in its territory to focus their operation in military weapons , vehicles, and supplies.
This caused the economic resources in soviet unions to be drained and the needs for goods that unrelated to military became abandoned.
The loyalist were American colonists who remained themselves loyal to the British crown during the American Revolutionary War.
