Read the excerpt and answer the following question.
Unlike the other empires, the Han Dynasty’s biggest problem came from a group within its empire. This group worked against the government in an attempt to bring peace and utopia to the empire. Instead, they weakened the government and caused instability and more rebellions.
What group is discussed in this passage?

A.
the Huns
B.
the Ostrogoths
C.
the Vandals
D.
the Yellow Turbans