I need the answer tonight

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.

by creating a labor shortage that pushed the continent toward a market economy

calvin taught his followers that human beings needed to follow strict rules to overcome their nature and do good. second choice