A line graph titled Daily Market for Perfect Pepperoni Pizza shows quantity on the x-axis from 0 to 30 and price in dollars on the y-axis from 0 to 20. A line labeled S starts at (0,3.5) and increases to points (5,5), (10,7.5), (15,10), (20,12.5), (25,15). A line labeled D starts at (0,16.5) and decreases to points (5,15), (10,12.5), (15,10), (20,7.5), (25,5). Both lines intersect at point E at 15,10. A vertical dashed line labeled Q extends from point E to bottom of graph and a horizontal dashed line labeled P extends from point E to left edge of graph.
the example above, what is the equilibrium quantity?
A.5
B.15
C.25
D.30