In Washington County, attendance at the movies is just large enough for the cinema operators to make modest profits. The size of the county's population is stable and is not expected to increase much. Yet there are investors ready to double the number of movie screens in the county within five years, and they are predicting solid profits both for themselves and for the established cinema operators. Which of the following, if true about Washington County, most helps to provide a justification for the investors' prediction? ["The sale of snacks and drinks in cinemas accounts for a steadily growing share of most cinema operators' profits.", 'As distinct from the existing cinemas, most of the cinemas being planned would be located in downtown areas, in hopes of stimulating an economic revitalization of those areas.', "Over the next ten years, people in their teenage years, the prime moviegoing age, will be a rapidly growing proportion of the county's population.", 'Spending on video purchases, as well as spending on video rentals, has been increasing modestly each year for the past ten years.']