Which Republics of the USSR Were Affected by Nationalist Unrest

Which republics of the USSR were affected by nationalist unrest in the late 1980s and early 1990s?

A) All the republics of the USSR were affected.
B) Only republics with a significant Muslim population were affected.
C) Only republics annexed during World War II were affected.
D) Only the Balkan states and Ukraine were affected.
E) Only publics with large Catholic populations were affected.