Trade Both Within and Beyond Mayan States Led to Which

Trade both within and beyond Mayan states led to which of the following?

A) a widening in the gap between the rich and poor of Mayan society
B) the dependence of Mayan states on the goodwill of neighboring communities that supplied them with vital resources and supplies
C) the domestication of large mammals to more easily transport goods from one place to another
D) the urbanization of Mayan territory