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). Two lines labeled D and D subscript 1 start at (0,16.5) and decrease to points (5,15), (10,12.5), (15,10), (20,7.5), (25,5). All 3 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. A vertical dashed line labeled Q subscript 1 intersects with a horizontal dashed line labeled P subscript 1 at point (20,12.5). In the example above, the increase in demand led to an increase in .
A.
price
B.
production cost
C.
quality
D.
cost efficiency

Please select the best answer from the choices provided

A
B
C
D