The Text Suggests That Globalization Has Challenged the Neat Categories

The text suggests that globalization has challenged the neat categories of Wallerstein's world systems theory,in that the flow of goods and ideas is less predictable,and the uneven development persists in much of the world.According to the world systems theory,this is likely because

A) there is not always geographical isolation between core and peripheral nations.
B) globalization creates geographical isolation between core and peripheral nations.
C) both core and peripheral nations are developing more rapidly.
D) semi-peripheral nations are major contributors to continued poverty.