Which option correctly pairs an event leading up to the outbreak of World War I with the term that BEST describes it? A Militarism France and the United States reduce the size of their armed forces in the early 1900s. B. Alliances Germany, Austria-Hungary, and Italy secretly agree to militarily support one another. C. Nationalism European nations grow resentrul over their treatment under the Treaty of Versailles D Imperialism A German submarine attacks and sinks the British ocean liner Lusitania in 1915.