How did U.S. neutrality in World War I finally come to an end? a. Ger

How did U.S. neutrality in World War I finally come to an end?

a. Germany proposed an alliance with Mexico and sank five American ships in ten days.
b. Russia formed an alliance with Germany that threatened U.S. interests in the Pacific.
c. The Allied nations begged the United States to intervene on their behalf.
d. Japan attacked the Philippines and Hawaii, killing hundreds of U.S. military personnel and citizens.
e. Germany formed an alliance with Cuba, threatening to bring the war to the United States.

ANSWER
A