What is the name for the following idea? if one country becomes communist, one by one, the others will also become communist until the entire region is under communist control.

a) the domino theory
b)the infection of communism
c)the containment strategy

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.

increasing defense spending.

explanation: