Question

which event preceded the revolutions of 1989?
solidarity candidates were elected in poland.
hungary implemented a free market economy.
communist rule ended in czechoslovakia.
gorbachev made reforms in the soviet union.

Explanation:

Mikhail Gorbachev's reforms in the Soviet Union, such as perestroika and glasnost, in the 1980s created an atmosphere that influenced the political changes in Eastern - Europe. The elections of Solidarity candidates in Poland were in 1989, Hungary implementing a free - market economy was also part of the 1989 changes, and the end of Communist rule in Czechoslovakia was a result of the 1989 revolutions. Gorbachev's reforms preceded all these events in the 1980s.

Answer:

D. Gorbachev made reforms in the Soviet Union.