Select the correct answer from each drop-down menu.
in the neolithic age, agriculture created supply of food. this development gave people the time to pursue new activities. some people focused on making better containers. such efforts led to the invention of the . other people focused on making stronger tools. they used their knowledge of metalworking to begin making tools with .

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.

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b. the right to wage war and make peace