What did the Serbians want, and why did this scare nations like Germany and Austria?

Upon Yugoslavia collapsing in the 1990s with multiple republics seeking secession, Serbian nationalists demanded that all Serbs in all the Yugoslav republics had the right to be united in a common state, ethnic conflict occurred between Serbs seeking unity with Serbia and other Yugoslav ethnicities seeking independence Austria-Hungary's desire to crush Serbia, and Russia's support for the latter during the crisis of 1914, were motivated by fear that they would lose their status as 'Great Powers' if they backed down.This connected Britain, France, and Russia in the 'Triple Entente' and stoked German fears of 'encirclement'.

Explanation:

c. it required that townships set aside land for public schools.