In the early 1930s, the American foreign policy was isolationist, but the ______ suddenly changed the whole situation, which propelled the U.S. into the Second World War.

In the early 1930s, the American foreign policy was isolationist, but the ______ suddenly changed the whole situation, which propelled the 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

正确答案是A