Answer:
Option B, It caused the United States to form a military alliance with countries from Western Europe
Step-by-step explanation:
The main ideology of the American foreign policy was Truman Doctrine devised by President Harry S. Truman in 1949. The agenda of the policy was to counter the geopolitical expansion of soviet during the cold war.
Hence, a military alliance was formed to restrict the European countries from poaching into others territory.
This alliance exists even today
Hence, option B is correct