What is the most likely reason the republics of yugoslavia held together until the fall of communism?
a.) all six republics shared strong historic bonds.
b.) the constitution forbade the republics to separate.
c.) citizens were united by their belief in communism.
d.) dictator josep tito was a very powerful leader.

D) Dictator Josep Tito was a very powerful leader.

Explanation:

Despite the fact that the six republics of Yugoslavia were all Slavic nations, people had familiar ancestry line, had similar dialects, and similar cultures, they were not the reasons why Yugoslavia was held together in one piece, however rather it was the leader, Josip Broz Tito, who held everything under control.  

Tito was an very powerful leader, very much regarded and respected all through the majority of the world, and he figured out how to keep the six republics together, despite the fact that sporadically with some extraordinary measures, and to create unity and fraternity between the general population that have traditionally detested one another.