What is containment mean? ?
us history

A policy for keeping the Soviet Union within its expanded postwar borders

Explanation:

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.

your answer is

to dominate europe

and i know for a fact it can't be the others