Cash crops such as tobacco or sugar required a lot of workers.
In 1985, reform-minded Mikhail Gorbachev came to power as General Secretary of the Soviet Union. He introduced reforms along liberal lines. The two reforms most commonly associated with him are glasnost and perestroika. Glasnost means 'openness' and refers to government transparency and increased freedom of expression.
Perestroika refers to a series of political and economic reforms meant to kickstart the stagnant 1980s economy of the Soviet Union. Its architect, President Mikhail Gorbachev, would oversee the most fundamental changes to his nation's economic engine and political structure since the Russian Revolution.
D or A is the answer. I least I narrowed it down.
They were accused of overproducing oil. Hope this Helps! :^)