Which of the following, if true, most strengthens the argument above? A. Since 2001, tourist guides along the Inca Trail have received 50% to 100% increases in take-home pay. B. Villages near Machu Picchu have experienced declines in income, as fewer tourists buy fewer craft goods and refreshments. C. Many of the funds from the sale of Inca Trail permits are used to staff a museum of Incan culture in Peru's capital city, Lima, and to hire guards for archaeological sites without permit programs. D. Since 2001, Incan ruins similar to Machu Picchu but not on the Inca Trail have disintegrated at a significantly greater rate than those on the trail. E. The total number of tourists in Peru has risen substantially since 2001, even as the number of tourists hiking the Inca Trail has remained constant.