Henry fords most noteworthy contribution to the industry is a.) invention of the computer b.) invention of buying cars on credit c.) innovation of “interchangeable parts” d.) perfection of the assembly line process of production

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.

a because i tried to vote with just my college id and the answer was no