Peggy's Twist Shack sells softserve ice cream. Peggy graphed the demand per week for vanilla ice cream cones. The graph indicates a demand schedule that slopes downward and to the right. This graph indicates that the quantity of vanilla ice cream cones demanded increases as:
a. cost increases.
b. supply decreases.
c. price increases.
d. price decreases.
e. supply increases.
ANSWER: d