The correct answer is C) It adopted isolationist foreign policies.
The BEST explanation of how the United States attempted to avoid becoming involved in another international crisis in Europe following World War I is that it adopted isolationist foreign policies.
Indeed, US President Woodrow Wilson had the intention to maintain the isolation of the US from the European conflicts previous its entrance to World War 1, by having a foreign policy of neutrality. The sinking of the Lusitania ship and the interception of the Zimmerman telegraph made the US enter World War 1. After that experience, the US decided to adopt again isolationist foreign policies to not mess into European conflicts, but the Pearl Harbor attack of December 1941, made President Franklin D. Roosevelt ask Congress for a Declaration of War, and the US entered World War II.