Which of the following best explains why americans formed political parties? a. to end disagreements about policy b. to unite farmers and merchants c. to organize support for their views so they can accomplish what is in their best interest d. to follow washington's advice in his farewell address

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.