Respuesta :
Answer:
Japans surprise attack on pearl harbor.
Explanation:
This website will provide more info https://history.state.gov/milestones/1937-1945/american-isolationism
The correct answer is letter A
Explanation: The United States represented an obstacle to Japanese expansion in the Pacific Ocean. Therefore, the Japanese military decided to attack Pearl Harbor, which was the main American naval base in the Pacific. But this event ended up making the US entering the war.