Answer: B. The country followed a policy of interventionism.
Step-by-step explanation:
The Cold War saw the United States and Soviet Russia fight it out for dominance across the world except they never actually engaged in direct conflict but rather supported various countries and forces that were fighting against the ideology of the other country.
As a result, the U.S. found that it had to increasingly involve itself in the affairs of other nations and so they followed a policy of interventionism in the hope that the spread of communism would be limited and the influence of the Soviet Union curtailed.