Nationalism spread across Europe during Napoleon's time. It was repressed for a generation under the Congress of Vienna and the Concert of Europe until the revolutions of 1845/1845. The term "Nationalism" can be defined as a group of people with the same nationality should unite together under a single flag. Napoleon nationalised France and then moved across the rest of Europe, conquering countries along the way. Eventually, Napolean was defeated and the Congress of Vienna was held by the heads of the European countries. The aim of these meeting was to ensure peace and stability in Europe. The revolutions of 1845/1848 overthrew the repressive European governments of the day.
Your answer would be D). Under the Marshall Plan, the U.S. and European nations can cooperate to rebuild Europe.
The reason why this would be your answer is because when you look at the poster, it has the U.S and multiple European country flags. The Marshall Plan was an aid that helped Western Europe. The countries on the windmill are from western Europe. Because of the Marshall Plan, the U.S helped western Europe of 12 billion dollars (100 billion in modern currency). Even the the United States became independent from Europe, they still were there to support the European economy.
Reparations for paying the war, in debt
It means Romanian Enlightenment features, in Romanian.