.w. . e What was the primary cause of the fall of the Zhou dynasty? O Nomadic tribes formed alliances with feudal leaders. OLeaders of the feudal states attacked the capital city Leaders of the feudal states declared independence NOItaiuIC UIDesuieu wuuNe Kimg agalnseduareaues.

i think it B but if I am wrong plz correct me  

Explanation:

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to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.