Answer:
The correct answer is Option D) It acted as a deterrent to NATO, the military alliance formed by the United States and Western Europe, leading to a stalemate in Europe.
Explanation:
United States and it's allies had formed the North Atlantic Treaty Organization (NATO) in 1949 as a mutual defense agreement between 12 countries from North America and Western European.
This was clearly seen as major powers coming together to form a collective block against the rise of Soviet Union.
Eventually the Soivet Union responded by singing the Warsaw Pact, a mutual defense agreement between 8 counties in 1955. It was a deterrent against, what was seen as US led influence in the region and resulted in a stalemate.