Which was a cause of world war ii? the invasion of austria by italy the u. s. decision to join the league of nations the establishment of german colonies in africa the british and french policy of appeasement

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.