Question 1. On a price-quantity graph, plot the quantity demanded for pizza for the whole class at the three prices $12, 5? and $16 (the answers to the rst three survey questions). Which of the following is true? a. The pizza poll data from this class violates the Law of Demand, because the demand curve slopes downward. b. The pizza poll data 'om this class violates the Law of Demand, because the demand curve slopes upward. c. The pizza poll data from this class provides evidence for the Law of Demand, because the demand curve slopes upward. d. The pizza poll data from this class provides evidence for the Law of Demand, because the demand curve slopes downward