the graph illustrates what economic principle?\na budget surplus\nb wage - price spiral\nc supply and…

Brief Explanations:

The graph has two curves with price on the y - axis and quantity on the x - axis. The upward - sloping curve represents supply (more quantity supplied at higher prices) and the downward - sloping curve represents demand (more quantity demanded at lower prices), which is characteristic of the supply and demand model.

Answer:

C. Supply and demand