Final answer:
The correct answer is option b. command economic system features the government as the main economic decision-maker.
Step-by-step explanation:
In a command economic system, the government is the main economic decision-maker. In this system, all economic decisions are made by government officials.
Unlike a market economy, where decisions are made privately by consumers and firms, a command economy involves collective government ownership of resources and centrally planned production.
It is important to note that most economies are mixed, meaning they incorporate elements of both market and command systems.