The correct Answer is A Hope this helps :)
Answer:
ww1 started in the middle east, Serbia wanted a part of the austrian-hungarian empire to be apart of their country. Next, the terrorist the black hand assassinated the archduke, thus resulting in austrian-hungarian coming in on serbia. After that, russia wanted to be a protector of serbia due to their religious similarities. Now russia was in germany entered because of the alliance agreements. next other countries joined. germany shot the first shot and was militarizing thus they wanted war.
Explanation:
D) second industrial revolution
