The correct answer is A) World War I.
The assassination of Franz Ferdinand, 28 June 1914 · RMS Lusitania sinks, 7 May 1915 · Battle of Verdun, February 1916-December 1916 · armistice day, 11 November 1918. The incidents and dates listed are most closely associated with which conflict World War I.
Nationalistic ideas, imperialistic decisions, and ethnicities problems were the causes of World War I in Europe. The armed conflict started after the assassination of Austrian Archduke Franz Ferdinand and his wife in Sarajevo. President Woodrow Wilson wanted to maintain the foreign policy of neutrality but the sinking of the Lusitania by the German Navy and the interception of the Zimmerman Telegram made President Wilson change his mind and asked Congress for a declaration of war against Germany on April 4, 1917.
