Glasnost was a series of reforms introduced by then General Secretary of the Soviet Union Mikhail Gorbachev in 1985. Most of the reforms he introduced were considered liberal by many experts. There were mainly two reforms associated with Mr. Gorbachev during this time, and they were Glasnost and Perestroika. With Glasnost which means openness, Mr. Gorbachev wanted the government to become more transparent, and also wanted the Soviet citizens to have more freedom of expression.
Choice D is the correct answer because unfortunately, as an unintended consequence of these reforms, more Soviet citizens took to the street to protest the different polices of the Soviet Government.
Finally, thanks to the increase protests by the Soviet citizens, East Germany which was controlled by the Soviets was able to unified with West Germany as a nation.