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:

Gorbachev's reforms in the Soviet Union, such as perestroika and glasnost, started in the mid - 1980s and set the stage for the political changes across Eastern Europe. Solidarity candidates were elected in Poland in 1989, Hungary's free - market economy implementation was also in the late 1980s but later than Gorbachev's reforms, and communist rule ended in Czechoslovakia as part of the 1989 revolutions.

Answer:

D. Gorbachev made reforms in the Soviet Union.