The answers you're looking for are
alliances, nationalism, and militarism. Or, A, B, and D. Imperialism was also a cause, but that's not one of the answers so...
Difference in policies were to blame, although the immediate cause of World War one was the assassination of Austria’s Archduke Franz Ferdinand. The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism. This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land.
Nationalism was a great cause of World War one because of countries being greedy and not negotiating. Nationalism shows you are proud of your country and want it to be the best.
Use this link for more info on it! https://medium.com/@dhireshnathwani/what-was-the-most-significant-cause-of-world-war-one-ww1-74bb9e8...
