Answer :
A result of the Columbian Exchange is New lives in America were possible for poor Europeans. Thus option A is appropriate.
What is Columbian Exchange?
The spread of illnesses and other organisms between the Old World of Europe and Africa and the New World of the Americas refers as Columbian Exchange which causes a great impact on the world.
Columbian Exchange introduced the growth in trade and food production. Introducing new commodities from the Americas, contributed to population increase in Europe and sparked the continent's economic transition to capitalism.
Therefore, option A New lives in America were possible for poor Europeans is the appropriate answer.
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