1. The demand for pizzas in a large town is written as: Qd = 120 - 10P + 5Pb - 0.5Ps - 10Y, where Qd is the quantity demanded, P is the price, Pb is the price of burritos, Ps is the price of soft drinks sold in the pizza restaurants, and Y is personal income per month (in thousand dollars). What is Q/Ps?

A) 5and pizzas are normal

B) -5 and pizzas are inferior

C) 0.5 and pizzas are inferior

D) -0.5 and pizzas are normal

E) -0.5 and pizzas are inferior