The main argument of the two sources are most similar in their emphasis on the "significance of European access to precious metals from the Americas."
So the correct answer is D) significance of European access to precious metals from the Americas.
The argument of Andre Gunder Frank refers to the fact that European nations benefitted from the silver materials from the American Continent.
He wrote his conclusions in "Reorient: Global Economy in the Asian Age, 1996."
On the other hand, David Christian wrote in "This Fleeting World: A Short Story of Humanity," that European countries seized the many resources of the American territories to gain access to the eastern and southern markets of Asia.
We have to get in mind that powerful European nations of that time just were interested in exploiting the many raw materials and natural resources that existed in the Americas.
We conclude that European nations could get access to Asian trade not because they had quality goods that interested the Asian markets, but they had to use American resources such as silver to have success with Asian trade.
Learn more about European trade in the middle ages here:
https://brainly.com/question/107727
