Answer:
The Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance
Explanation:
There was six articles and the terms lasted 30 years in force.
I think the answer is C because other choices doesn't really make sense. Especially choice A. Hope this helped.
The Congress of Vienna reorganized Europe after the Napoleonic Wars.
The major goal was to establish a balance between the Five Powers - Austria, Prussia, England, France and Russia -
As a result, the French returned territories gained by Napoleon from 1795 - 1810. Russia extended its powers and received souveranity over Poland and Finland. Austria, too extended its territory.