The correct answer is A. Marshall Plan.
The treaty of Versailles was an international agreement that put an end to the WWI and established an economic recovery plan for the reconstruction of the victorious countries. This treaty put all the responsibility of the war on the central powers, who had to pay exorbitant compensations to the allies.
The Marshall plan was a United States initiative to help Western European countries to recover after WWII, mainly the UK, France, and Western Germany. Its main goal was to avoid Communism to spread over Western Europe and to make of these countries important allies of the United States against the Soviet Union.
Due to the common objectives of these two economic recovery plans and the context in which they were applied, we can see they share many similarities.
Vietnam become a single communist nation through the leadership and influence of Who Chi Minh. He embraced communism and he got support from China and Soviet Union to fight the French regime.
Hope this helps you! Brainliest? :)
Todo app for my iPad to use and the iPad version of answer is A