Oracle bones found in china indicate which development made by bronze age civilizations
a. the foundation of daoism
b. animal domestication practices
c. advanced artwork techniques
d. a written system of lauguage

D. a written system of language

Explanation:

AN oracle bone were pieces of bones commonly ox and turtles that were used in ancient China to make predictions and divinations on the future, it was a common use of the Chinese people on this period of time to write symbols on  the bone and then put it into a fire, to see how the bone will crack and wherever the bone cracked that would be the fate of the person that they were trying to predict the future of, this was a common practice and it is believed that helped develop the written system of language.

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.