It was a trigger that showed that there were two competing powers in Europe: Russia and Austria-Hungary (and their allies).
Franz Ferdinand was killed by a Serbian separatist and the Austrians wanted him to be punished. On the other hand, Russia supported Serbia is saying that Austrian demands ( to be allowed to search for the culprit inside Serbia) were too much.
This lead to a direct conflict between the two powers (Austria and Russia) and further lead to the war.
I'm sure the answer is: A. Gustav Eiffel, but in school I learned that <span>Stephen Sauvestre was the one who built it. </span>
They believed that the minors had invaded their territory.
C) allowing free and fair elections