Which of the Following Best Describes the Differences in the Waterways

Which of the following best describes the differences in the waterways of the Americas and Afroeurasia?

A) Unlike Afroeurasia, an extensive system of seas links North and South America.
B) The peoples of North and South America, unlike those of Afroeurasia, were unable to navigate rivers and as a result had very limited contact with one another.
C) Afroeurasia has no comparable counterparts to the Mississippi and Amazon watersheds.
D) Unlike North and South America, the seas of Afroeurasia proved to be a serious impediment to trade and transportation.