A. used the attack to justify taking aggressive action against Serbia
Explanation:
Austria-Hungary sent them an ultimatum to Serbia, and Serbia agreed to most of it but the only part it didn't agree to was that Austria-Hungary was able to do an investigation of who did the assassination in which Serbia refused for Austria-Hungary to investigate. This then went to the German's in which they backed Austria-Hungary for being an ally in the war which then led to the out-break of world war 1.
Correct answer is A. used the attack to justify taking aggressive action against Serbia
.
Explanation:
Option A is correct because after the assassination on June 28th 1914, Austria-Hungary declared war on Serbia on July 28th, starting a great offensive on its western and northern boundaries.
B is not correct as Ottomans entered the war in later stage, and Serbia was not their territory.
C is not correct as Germany stayed on the side of Austria-Hungary.
D is not correct as Triple Entente fought against Austria-Hungary in this war.
