(Figure: Supply Curve) Refer to the Figure

Multiple Choice

(Figure: Supply Curve) Refer to the figure. A vertical readingof the figure indicates that:

A) at a price higher than $40, the quantity supplied drops to zero.
B) to produce 500 units suppliers must be paid at least $40 per unit.
C) at a price of $40 per unit, suppliers are willing and able to sell 500 units.
D) at a price lower than $40, the quantity supplied drops to zero.