Final answer:
A command economy is defined as an economic system where the government owns and runs all the businesses, corresponding to option C. In such economies, the government makes all decisions about production and distribution of goods and services.
Step-by-step explanation:
A command economy is an economic system where the government has full control over the production and distribution of goods and services. This includes making all decisions about what goods and services to produce, how much to produce, and at what price to sell them. In this system, the government owns and runs all the businesses, which aligns with option C in the provided choices.
In contrast to a command economy, an economy where individuals own businesses and compete for profits is known as a market economy. A mixed economy features both private enterprise and some level of government ownership, which partially describes options A and B. Option D suggests a communal ownership model which is not typically representative of a command economy.