The increase in the price of housing in city Y has been caused by a decline in the number of housing units available compared to the influx of new residents to city Y searching for housing. Nevertheless, the total number of available housing units is presently larger than it was last month. If the statements above are true, which one of the following can be properly inferred? ['The number of residents seeking housing has increased over the last month.', 'The number of landlords leaving the housing market has increased this month.', 'A lack of available housing will deter new people from living in city Y.', 'The cost of housing will continue to rise in proportion to demand.']