Question

Which of the following best describes the changes brought to world populations as a result of the European colonization of the Americas?
a. The African population nearly doubled, the European population dropped greatly, and millions of Native Americans were sent to Europe as slaves.
b. The African population nearly doubled, the Native American population dropped greatly, and millions of Europeans were sent to the Americas as slaves.
c. The Native American population nearly doubled, the African population dropped greatly, and millions of Europeans were sent to Africa.
d. The European population nearly doubled, the Native American population dropped greatly, and millions of Africans were sent to the Americas as slaves. End of exam

Answer 1

What we know for sure is that the Native American population drastically dropped as a result of illnesses that the Europeans brought with them.

Also, we know that a great number of Africans were brought to America as slaves (today's African Americans are their descedants)- these two facts already let us 
choose the best answer , that is d!