(A) an entente
(B) a mobilization
(C) ** an ultimatum
(D) a red card
EXPLANATIONS BELOW
Concept note-1: -On July 5, a week after Franz Ferdinand’s assassination, Kaiser Wilhelm II gave Austria what it wanted: the promise of Germany’s “faithful support” if Russia came to Serbia’s aid. With the Kaiser’s so-called blank check in hand, Austrian officials began drafting an ultimatum to Serbia.
Concept note-2: -According to the terms of the ultimatum delivered on July 23, the Serbian government would have to accept an Austro-Hungarian inquiry into the assassination, notwithstanding its claim that it was already conducting its own internal investigation.
Concept note-3: -Austria-Hungary’s Ultimatum to Serbia (2) To dissolve immediately the group named “Narodna Odbrana, ” to confiscate all its means of propaganda, and to proceed in the same manner against other societies and their branches in Serbia which engage in propaganda against the Austro-Hungarian Monarchy.
Concept note-4: -Convinced that the Serbian government had assisted Princip’s group, Austria-Hungary issued a series of harsh demands, most of which the Serbs accepted. Austria-Hungary nevertheless declared war on Serbia on 28 July, setting off a chain reaction of military mobilisations prompted by Europe’s system of alliances.
Concept note-5: -The first was that Serbia allow Austro-Hungarian officials to come into Serbia and suppress anti-Austrian elements of the country. The second was that Serbia suppress anti-Austrian propaganda and anti-Austrian terrorist organizations within the country.