Question ID:PT82 S4 Q21 Passage:Restaurant critic: Most people agree that the food at Marva's Diner is exceptional, while the food at the more popular Traintrack Inn is fairly ordinary. This discrepancy should come as no surprise, since the Traintrack Inn's more convenient location is by itself almost enough to guarantee a steady flow of customers. Stem:Which one of the following is a principle that, if valid, most helps to justify the restaurant critic's reasoning? Correct Answer Choice:DChoice A:The best way for a business to attract a steady flow of customers is to improve its products. Choice B:Any restaurant can become more popular by moving to a more convenient location. Choice C:The quality of the food at a restaurant is the most important factor in its popularity. Choice D:A business will improve its products only when it is necessary to do so in order to attract customers. Choice E:There is no relationship between the quality of a restaurant's food and the popularity of that restaurant.