Free points merry christmas and i know 5 points is not enough that's all i can do right now. stay safe i love all of you Merry Christmas

HOHOHO

thanks u too

Explanation:

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.

the answers is b.   environments.