A(n) is a person who is not actively involved in a nation’s armed forces.
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Civilian

A civilian is a person who is not actively involved in a nation's military, police or firefighting force. The word derives from the idea of "civil law." During conflict, civilians are entitled to receive certain privileges under customary international law. The term is often used interchangeably with "non-combatant."

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.

articles of confederation