The correct answer is b) It shows the relationship between supply and demand.
The circular flow diagram is a model in economics that basically explains how the economy functions. The main characters are households which represent costumers and the firms which represent producers. Explains how the economics function in a circular way, where there has to be always a supplier and always a costumer, for there to be a flow and an equilibrium in the goods that are produced, and the goods that are demanded.
