What Adam Smith viewed as the most efficient means to economy stability and viewed as a threat to that system is option C. A free market system was the most efficient means to economy stability, and government regulation was a threat.
Smith argued that by giving everyone the freedom to produce and exchange goods as they pleased (free trade) and opening the markets up to domestic and foreign competition, people's natural self-interest would promote greater prosperity than could stringent government regulations.
Free trade, also called laissez-faire, a policy by which a government does not discriminate against imports or interfere with exports by applying tariffs (to imports) or subsidies (to exports).
Therefore, the correct answer is as given above
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