the citizens of the united states live and work in a\no closed economy.\no command economy.\no mixed market…

Brief Explanation:

The U.S. economy has elements of both private - sector market forces and government intervention. A closed economy has no foreign trade, a command economy is centrally planned, and a pure market economy has no government involvement. The U.S. is a mixed - market economy with a blend of market and government influence.

Answer:

C. mixed market economy