1. Since the demand for labor is like the demand for any other good, how might the following factors shift thedemand for janitors at McDonald's? I. A new junior high school opens up across the street from McDonald's. II. Customers suddenly become much more concerned about clean restaurants and they'll walk out if there'sdirt on the floor. III. As robots like the Roomba vacuum cleaner become cheaper, McDonald's buys some robots to do half thejanitors' work.a.I and III would increase demand and II would decrease demand.b.I and II would increase demand, and III would decrease demand.c.III would increase demand and I and II would decrease demand.d.II would increase demand, and I and III would decrease demand.