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.
The best and most correct answer among the choices provided by the question is TRUE<span>.
</span><span>Psychology is considered a science because it uses a systematic method of asking and answering questions but it is considered as soft science.
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Hope my answer would be a great help for you. </span>
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Intensity is the word you are looking for.