Which european economic practice most affected the ability of africans to run their own economies?
a. forced labor
b. restrictions on crop choice
c. divisions among labor force
d. heavy taxation

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.