The right answer is D) threats to American security made by Germany.
Most Americans supported the Triple Entente or Allied Powers, at the outbreak of World War I. The, Wilson administration declared the nation neutral but allowed businesses to extend credit to the Allies to purchase food and military supplies. Americans were outraged by the Germans’ use of unlimited submarine warfare, especially after the 1915 sinking of the British liner Lusitania. In 1917 unrestricted submarine activity and the revelation of the Zimmermann telegram, in which the Germans sought to incite the Mexicans to wage war against the United States, led the United States to enter the Great War.