Decide whether each of the following descriptions most closely corresponds to being part of a command system, a market system, or a laissez-faire system. 

a. A woman who wants to start a flower shop finds she cannot do so unless the central government has already decided to allow a flower shop in her area.

b. Shops stock and sell the goods their customers want but the government levies a sales tax on each transaction in order to fund elementary schools, public libraries, and welfare programs for the poor.

c. The only taxes levied by the government are to pay for national defense, law enforcement, and a legal system designed to enforce contracts between private citizens.