Answer:
C. Nonprice methods of rationing emerge.
Step-by-step explanation:
Since the landlords can only rent the apartments on the regulated price, no matter how high the demand nor how low the supply, it is inevitable that certain rationing model would appear, that is not based on the cost of the apartment.
Perhaps the landlords would prioritize families to move in to their apartment, or maybe the landlords would prioritize individuals who are not from out-of-state. It is also possible to prioritize by other aspects, such as gender or race.