I would say A and B are correct.
Answer:
C - Members of the lower class packed into tenement housing.
E - Political machines dominated local politics.
F - Land prices declined as the land was polluted.
Explanation:
Both groups are called Slavs. In the years before World War I, Serbia wanted all Slavic peoples to form one empire, free from rule by the Turks or Austria-Hungary. The Serbs' wish to unite all the Slavs in one empire is an example of. imperialism.