Which of the following government actions is necessary to guarantee the
conditions required for a free-market system?

The correct answer to this open question is the following.

To guarantee the conditions required for a free-market system the federal government needs to have the proper legislation that allows companies to compete in the free market, with minimum intervention of the government. The government has to pay close attention to the way companies perform in the market where supply and demand establish prices. The government is there to avoid the chance of companies creates monopolies, to participate as an intermediary in conflicts, to protect the environment or protect consumers' rights.

your answer would be a) no nation can be economically self-sufficient.

stay in school!

this is a good question! i'll do some research and come back when i have the answer!