A demand curve that is perfectly inelastic is:

A) horizontal.
B) vertical.
C) downward sloping.
D) upward sloping.

Perfectly Inelastic

Describing a situation where the quantity demanded or supplied of a good does not change in response to a price change.

Demand Curve

A graphical representation of the quantity of a good that consumers are willing and able to purchase at various prices during a given period.