This is an example of an intrinsic reward.
Intrinsic rewards are internal - they refer to feelings of accomplishment, of success, of pride, and are intangible, meaning that you cannot touch them. On the other hand, extrinsic rewards are actual objects that you receive as a reward for something you did.
You must read the directions, because I will not do your homework for you.
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 to see him 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 think it was Joseph Adonis