The sentence that was an economic perestroika reform introduced by Gorbachev is option D. allowing western investment in Soviet companies. Hence, the correct answer is option D. The Policy reforms included the Law on State Enterprise, the Law on Cooperatives, and the opening of the Soviet economy to foreign investment.
The literal meaning of perestroika is "reconstruction", referring to the restructuring of the Soviet political and economic system, in an attempt to end the Era of Stagnation.
Therefore the correct answer is as given above
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