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Critical Reasoning Question

For years the beautiful Renaissance buildings in Palitito have been damaged by exhaust from the many tour buses that come to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tour buses, so damage to Palitito’s buildings from the buses’ exhaust will diminish significantly.

Which of the following, if true, most strongly supports the argument?

A The exhaust from Palitito’s few automobiles is not a significant threat to Palitito’s buildings.

B Palitito’s Renaissance buildings are not threatened by pollution other than engine exhaust.

C Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another.

D More tourists come to Palitito 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 Palitito while their passengers are visiting a site.

【I choose E, and the answer is C, now I understand why C is right, but I want to know how could I aviod choosing E, because I think if I choose it again, after the first glance, E still seems like the right answer >.<】

My analysis is as followings
no enough parking→idle→exhaust→damage
C: 说明necessary condition是true,车只花很少的时间送客人,因此车停在有限的停车场的时间很长,因此没有地方parking的车有很长时间用来idle
E: 原题中就是在说找不到parking的车就会idle,属于重复原题中的现象,没有任何增强的作用,且不管是不是增加1/3的parking,这个现象都会存在

Is my analysis correct? and I want to know if you do this question, how will you analyze it?

Thank you so much~

Fact 1. (q) Renaissance Buildings in Palitito have been damaged by exhaust from tour buses.
Effect -> Cause (Abduction)
Cause: Little parking space § -> many tour buses idle (p1) -> bus idling exhaust is the main reason for the damage (p2)(as idling provides as much exhaust as driving) -> q
Plan of Action: Remove the bad cause -> more parking -> no bad effect (diminish significantly)

A: support fact 1 that does not need to be supported
B: support fact 1 that does not need to be supported
C: If C is true -> 3/4 of time the buses are idling - Prove that bus idling exhaust the main reason for bus exhaust and thus the main reason for the damage (Not necessary condition is true, this is a proof)
D. Unrelated (fighting against the fact 1)
E. This is rather weakening than support. The buses drive around the city and thus weaken the causal relationship p->p1

Ah I get it, it’s very clear~
Thank you so much~♥