I think it's D) Because I know they had to make sacrifices..
The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada.
Europe is modern country. the some scientist Born in Europe so Europe became scientific revolution
Answer:
Yuan dynasty was marked by struggle, famine, and bitterness among the populace.
Hope this helped!