Respuesta :
One of the reasons why the United States entered World War I on the Allied side was because "b. German U-boats sank unarmed ships carrying American passengers," through a policy of "unrestricted" submarine warfare. There were also ideological and racial reasons for joining the Allies as well, however.
Answer:
b. German U-boats sank unarmed ships carrying American passengers.
Explanation:
I took the quiz for K12 and got the answer correct.