Final answer:
After the fall of the Soviet Union, numerous Eastern European countries transitioned to capitalism in a relatively rapid time period. Czechoslovakia was the first country to transition, with its labor union called Labor Solidarity playing a significant role in the process. Poland joined the European Union in 2004.
Step-by-step explanation:
The answer is B) Rapid; Czechoslovakia; Labor Solidarity; European.
After the fall of the Soviet Union, numerous Eastern European countries transitioned to capitalism in a relatively rapid time period. Czechoslovakia was the first country to transition, with its labor union called Labor Solidarity playing a significant role in the process. Poland joined the European Union in 2004, which is an association of European nations aiming to develop a single market. Hungary's transition was helped by its thriving black market, where entrepreneurs and merchants sold goods illegally.