What Circumstance Led to an American Posture in Which True

What circumstance led to an American posture in which true neutrality was dead?

A) the British blockade, which cut off U.S. trade with Germany while supplies still flowed to the Allies
B) the British blockade, which infuriated Wilson to the point of embargoing U.S. trade
C) German war propaganda, which recruited thousands of influential German-Americans to lobby on behalf of the German cause
D) German war propaganda, which so alienated German Americans that they shifted their support to the British