The Idea of an "Afro-Eurasian Supercontinent" Makes Most Sense in Terms

The idea of an "Afro-Eurasian supercontinent" makes most sense in terms of which of the following?

A) Mongol rulers united all of these regions in one empire.
B) Religious unity and a common culture spread across the continents.
C) Land and sea trade routes created interconnectedness across diverse political and economic entities.
D) A common language permitted chroniclers to describe the history of all three continents.