The 16th-century Fountain of Moses, a testament to the power of Pope Sixtus V, sparkled after a restoration was finished in 1988 in Rome. But now the likeness of the biblical hero that adorns the fountain is turning black, the victim of a constant barrage of traffic exhaust and other pollutants. Tour buses that come to the city are believed to be a major contributor to the pollution. With few parking spaces available in a city filled with historical monuments, most buses have idled at the curb during each stop on their tour. Such idling produces as much exhaust as driving. Rome has now provided parking that accommodates a third of the tour buses, so damage to Rome's artistic monuments from the buses' exhaust will diminish significantly.
Which of the following, if true, most strongly supports the argument?
(A)The exhaust from Rome's few automobiles is not a significant threat.
(B)Rome's artistic monuments are not threatened by pollution other than engine exhaust.
(C)Tour buses typically spend less than one-fifth of the time they are in Rome transporting passengers from one site to another.
(D)More tourists come to Rome by tour bus than by any other single means of transportation.
(E)Some of the tour buses that are unable to find parking drive around Rome while their passengers are visiting a site.
This statement helps most in finding the right answer :"idling produces as much exhaust as driving".
Currently, idling or driving, if buses are present the pollution is same. But if parking is provided - idling stops and thus pollution goes down.
In ans C it clearly identifies that tourists buses only spend 1/5th time in trasporting and (4/5th idling). Thus if parking is provided there would be a significant reduction in pollution.
Ans C it is.
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