Which phrase characterizes the way both sides fought world war i?
they sent large armies to occupy heavily fortified defensive positions.
they relied on air and naval power to bomb coastal population centers.
they used mechanized units to move rapidly from one battle to another.
they attacked industrial regions to destroy the other side’s industry.

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 standing committee

explanation: