The correct option is A.
Adam Smith's opinion on laissez-faire economics holds that government should contribute very minimal intervention to business entities. Under this set up, the government allow private firms to make their own decisions about what to produce, how to produce and for whom to produce. One of the benefits of laissez-faire is that it discourages inefficiency and corruption of maximum government participation in business. It also encourages entrepreneurs to have incentive to work hard and create products that consumers wants.
The "long march" of China was led by Mao Zedong so its C.
