From 1914 to 1916, Trade Between the United States and the European

From 1914 to 1916, trade between the United States and the European Allies

A) was seriously disrupted by German submarine attacks.
B) violated international neutrality laws.
C) was required by law to be carried only on British ships.
D) made America eager to enter World War I.
E) pulled the American economy into an economic boom.