So the new nation doesn't collapse on its-self <span />
Machine Guns, Artillery Fire, and Mines
Answer:
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.
