(A) July 4, 1915
(B) April 12, 1916
(C) ** June 28, 1914
(D) November 15, 1917
EXPLANATIONS BELOW
Concept note-1: -At around 11 a.m. today, two shots rang out from a street corner in the center of this city, mortally wounding the archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire and Sophie the Duchess of Hohenberg, his wife.
Concept note-2: -Two shots in Sarajevo ignited the fires of war and drew Europe toward World War I. Just hours after narrowly escaping an assassin’s bomb, Archduke Franz Ferdinand, the heir to Austro-Hungarian throne and his wife, the Duchess of Hohenberg, are killed by Gavrilo Princip.
Concept note-3: -The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie in Sarajevo (the capital of the Austro-Hungarian province of Bosnia-Herzegovina) on 28 June 1914 eventually led to the outbreak of the First World War.
Concept note-4: -On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.