What role do government agencies play in a mixed market economy?

they run shipping companies and other sources of distribution.
they own farms, factories, and other sources of production.
they regulate some aspects of production and distribution.
they employ most of the workers in the economic system.

They regulate some aspects of production and distribution.

The correct answer is: "They regulate some aspects of production and distribution".

In a mixed market economy, economic authorities implement income redistribution systems that reduce income inequalities and generate fairer outcomes for all the individuals that conform the society, if compared to the results that would be generated by the free interaction of economic agents in the markets (pure market economy situation).

Therefore, these economies are characterized by goverment interventionism and income redistribution systems.