The curve in the above graph:

A) can only be a perfectly inelastic demand curve.
B) can only be a perfectly inelastic supply curve.
C) may be either a perfectly inelastic demand curve or a perfectly inelastic supply curve.
D) can be neither a perfectly inelastic demand curve nor a perfectly inelastic supply curve.

Perfectly Inelastic

A situation in demand where the quantity demanded does not change in response to a change in price; represented graphically as a completely vertical demand curve.

Demand Curve

A graphical representation showing the relationship between the price of a good or service and the quantity demanded by consumers at various prices.

Supply Curve

A graphical representation of the relationship between the price of a good and the quantity of the good that suppliers are willing to sell.