Which of the following policy was adopted by Britain in Europe after WWII? A: isolationist policy B: cooperation policy C: appeasement policy D: alliance policy

In the early 1930s, the American foreign policy was isolationist,but the ______ suddenly changed the whole situation, which propelledthe U.S. into the Second World War. A: Pearl Harbor attack B: bombing of Guam island C: seizing of American merchant ships D: sinking of American passenger ships