The correct answer is A.
In a laissez-faire market there is no goverment intervention. Economic decisions are reached by the free interactions of the economic agents (households, firms and public sector) in the markets. Prices and exchanged outcomes are determined by the equilibrium between the desires of producers and consumers.
The abovementioned freedom that economic agents enjoy in the markets, allows them to pursue the market outcome that they believe will be more benefitial to them. This system ends up maximizing social welfare and curing poverty because it incentives the fullfilment of the self-interest of its individuals.
