Which of the following statements illustrates a rent ceiling? A. The interest on mortgage loans has gone up to 4.87 percent in 2013. B. Bluestone Properties is permitted to charge a rent of $2,350 for 2-bedroom apartments that would rent for $2,500 in an unregulated market. C. A housing shortage due to floods last summer has resulted in a rise in apartment rents in Denver. D. In Los Angeles, tenants have to pay a rent as high as $2,200 per month, so people prefer buying houses.