Driving the steep road to the mountaintop Inca ruins of Machu Picchu is potentially dangerous and hiking there is difficult. Now the Peruvian government is installing a cable car that will make access much easier, and hence result in a large increase in tourism. However, since the presence of large numbers of tourists tends to accelerate the deterioration of a site, installation of the cable car is certain to result in harm to the ruins. Which of the following, if true, most seriously calls into question the argument?
A: The daily number of tourists that are expected to take the cable car to Machu Piccu is smaller than the original resident population of Incas.
B: The construction of the cable car terminal at Machu Picchu will require the use of potentially damaging heavy machinery at the site.
C: Machu Picchu is already one of the most popular tourist sites in Peru.
D: The cable car will replace the tour buses whose large wheels and corrosive exhaust at present do significant damage to the site.
Choose A, B, C or D as your solution.
D