Answer:
D. The U.S. adopted an isolationist policy.
Step-by-step explanation:
World War I had a significant impact on U.S. foreign policy, leading to a period of isolationism where the United States sought to avoid entanglement in European conflicts and focus on its domestic affairs. This isolationist stance was characterized by policies aimed at staying out of international disputes and avoiding alliances that might draw the U.S. into future conflicts.