The way in which President Reagan acknowledged Mikhail Gorbachev's role in ending communism in this passage is option D.
This refers to the use of evidence in order to validate a claim with the use of either factual or statistical evidence.
With this in mind and from the complete text, we can see that President Reagan publicly acknowledged Mikhail Gorbachev's role in ending communism because he refers to some of the results of perestroika and glasnost in the Soviet Union.
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