4) Refer to Figure 6.1.1. If the demand for rental housing increases and the demand curve shifts rightward from Do to D1, and there is a strictly enforced rent ceiling of $150 per room, A) the number of rooms rented will increase to 2,000. B) the number of rooms rented is 1,500. C) there is a housing shortage of 500 rooms. D) the number of rooms rented decreases to 1,000. E) both E and C