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E - buses that would otherwise park and not give off exhaust fumes are instead drivign around the city thereby letting out exhaust which damages the buildings...now that some of those bus drivers can park, turn off engines, and not put out exhaust the damage caused by bus exhaust should decrease
The argument claims that "idling during each stop" is a killer responsible for the damage to the buiding-the cause of the polution. So you should focus on "idling", not on "other polution" in B, not "parking in E", not the number of tourists in D.
Only C. first you may confuse becasue C does not say directly on "idling". But C implies that tour buses spent more than 3/4 time idling each stop. So C strongly strenthens the argument. _________________
CR in my own words: exhaust damage building. only at parking, there is no exhaust. Now more parking. So less idling. less exhaust. Now strengthen this : Say all buses use parking effectively. Or there is a big need for parking.
A- Wrong B- Third party. wrong C -Correct. 3/4 of the time they can stay in parking zone. Our answer. D -Wrong - No parking space mentioned. Not related to strengthening. E - Weakening - Wrong. _________________
Many people dream, but some wake up and work towards it.
doesnt B strengthen the argument??? cus if B wasnt true the argument would be really weak..
You definitely have a point. But, I think you reasoning is overlapping with 'identifying assumption' question. I mean B is one of the assumptions that author is making to draw the conclusion. If B is right then,why not A. A is also an assumption.
Conclusion of the argument is "damage to X from the buses's exhaust will diminish significantly". So, I thought A and B are a little out of scope from the bolded portion above, though I agree A and B are valid statements. The only reason for eliminating B is , if B is right then A is also right. I thought this is a trap and eliminated both A and B. I may be missing something here.
E is still the correct answer IMO. Only E suggests a definite reduction in the bus exhaust casuing damage to the buildings. We know with certainty (because the stimulus tells us as much) that there are bus drivers who drove around emitting bus exhaust that were searching for parking but could not find any thereby informing us that they would park if given the opportunity which would reduce their exhaust emissions.
Problems with other choices:
B - outside scope - stimulus and question only concerned with damage caused to buildings by bus exhaust (states this explicitly). Also, omits any mention of "other" pollutants and their possible effects on buildings.
C - while it tells us the bus drivers spend only 1/4 time driving tourists between sites, it does not tell us the bus drivers will reduce their output of exhaust by parking in the new facilities and turnign off engines. You cannot take this answert to imply that action.