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2 close options are A and D

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

Many means anything more than 2. So we cant really infer anything substantial from this.


(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

This options says most (more than 50%) congestion is due to commercial vehicles, so carpooling will not make much of a difference and hence weakens.

Correct: D
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Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion?

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.-Number of single-occupancy vehicles will not reduce leading to failure of plan to reduce traffic congestion

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.-Doesn't specifically motivate/demotivate single-occupancy vehicles with tax incentives

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.-Doesn't specifically alter behaviour of single-occupancy vehicles

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.-Doesn't specifically alter behaviour of single-occupancy vehicles

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.-Doesn't specifically alter behaviour of single-occupancy vehicles
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Answer: A

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

Yes. If we assume that the reason people do not carpool because of the flexibility and privacy, then monetary (tax) incentives will not have a great impact on the drivers' choice.

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.

This claim has no basis. Even if it did, it can still reduce traffic by eliminating some higher-income drivers.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.

not related to the claim. people with a car will prefer carpooling to public transportation.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

while commercial vehicles can play a big role in traffic congestion, the city is looking to reduce single-travel occupants. the claim does not try to change how commercial vehicles affect traffic.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.

the question is about the effectiveness of the claim, which is to reduce lone drivers to decrease traffic. the city's approach is not monetarily incentivised.
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Bunuel
­Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion?

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.



­
 


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­Reasoning: Traffic congestion reduced by car pooling.
Weakens if car pool does not affect vehicles that causes congestion.

A Driver prefer but preference does not means they do travel. Eliminate.
B Even if high income drivers but it will reduce the congestion to some amount. Eliminate
C Out of scope.
D Correct. Weakens the argumentas car pooling will not affect the commercial vehicles.
E Initially however later it may benefit. Eliminate. 
IMO D 
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Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

Core of ARguement: reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling. (not relevant)

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.(not relevant)

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.(not relevant)

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. (directly challenges the arguement)

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures. (not relevant)­
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­Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion?
Quote:
 (A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
If many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling, then  plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives will most likely fail. The statement raises the  serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion but statement D raises most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion. Option D is a better choice
Incorrect
Quote:
 (B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
The argument is NOT concerned with differentiation between higher-income drivers & lower-income commuters.
Incorrect
Quote:
 (C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative, then the city's plan to decrease traffic congestion will most likely succeed regardless of the tax incentives.
Incorrect
Quote:
 (D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease which will decrease traffic congestion. This statement raises the most serioius doubt regarding the effectiveness of the city's plan to decrease traffic congestion.
Correct
Quote:
 (E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures. 
 
The argument is NOT concerned with loss in tax revenues or other traffic reduction measures.
Incorrect

IMO D
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This is weakening question. So we need to find an answer that weakens why carpooling tax incentives won't reduce the traffic congestion.
A. Slightly weakens the argument. if they prefer traveling alone, some may won't be moved by the tax incentives and some may.
B. We don't know how much upper class people are there, so without evidence we can't conclude this one weakens the argument.
C. Irrelevant. Because argument is about carpooling, not the public transport, it is not connected.
D. If these cars are not affected, our tax incentive program will SUFFER a lot!
E. We can't compare these two methods, one the tax incentive, and another one other method.
So correct one is answer (D)
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according to me a is the answer as it weakens the plan of the of implementing carpooling by giving tax incentives.
as it says that many people prefer traveling alone.­
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A - Correct. If drivers prefer to travel alone despite tax incentives, the plan would not be successful 

B - Even if only higher income drivers participate in reducing congestion, it'll still reduce traffic congestion.

C - Along with the public transport initiative, the carpooling initiative can still supplement in reducing congestion on roads.

D - Even if only a small share of congestion is reduced, it still is effective in reducing the congestion on roads.

E - Irrelevant to our plan of whether the carpooling initiative will reduce traffic congestion.

Therefore, A

 
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­"assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease."

We need an option that targets this assumption.
Even if we are able to reduce single-occupancy vehicles, overall traffic volume wont decrease much. So, we are looking for something that says that urban planner is trying to look for solutions for something that is not the actual problem.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
Bazinga! Hence we have a huge reason to doubt the effectiveness of the city's plan to decrease traffic congestion.

Please Note: The main reason we went for this option is the word most. In the absence of the word most this option would not have been a clear winner.
Ans D
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The major concern here is about reduction of traffic. THat was the reason for implementing carpooling incentives. If the main reason for traffic is commercial vehicles instead then the carpool­ing solution is not good enough
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­Urban Planner's Claim: The city plans to reduce traffic congestion (Goal) by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives (Plan). The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease (Assumed Cause-effect).

Urban planner's claim is that carpooling will reduce traffic congestion by motivating drivers to share rides with other people, Because of that plan implementation, number of single-occupancy vehicles on the road will be reduced. This claim assumes that carpooling will lead to fewer cars on the road and thus reduce traffic congestion.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion? - casts doubt the effectiveness of plan to achieve its goal

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
This option states that personal preferences for flexibility and privacy may outweigh the financial incentives, leading to low participation in carpooling. It opposes the premise of the argument that there will be less cars on the road. Premise can't be challenged.so wrong


(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
This option does not create doubt about effectiveness of plan to reduce traffic congestion. Although low income drivers participate less, high income drivers can commute more. so wrong.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
This option presents another reason to increase of public transportation system that can reduce traffic congestion but it does not creates doubt on effectiveness of plan regarding reduction in no. of single occupancy. so incorrect.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
This option hits the bull's eye. If most traffic congestion is not because of single occupancy of drivers but commercial vehicles, then the goal can not be achieved as they can't do car pooling. It will derails the effectiveness of the discussed plan.so correct.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.
This option addressed financial concern but not effectiveness of the discussed plan.so incorrect.

IMO answer is D.­
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­Choice D

Goal: Reduce traffic congestion
Plan: Encourage car pooling with tax incentives
Reasoning: By reducing single occupancy vehicles, traffic volume will decrease

Question: Weaken type. Choice that raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion.

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling. This choice weakens the argument, but the use of Many in this case suggests that the number of such drivers is > 2. Think logically, if only 2 or 3 (significantly fewer drivers) aren't in the car pooling idea, then would it raise serious doubts on the effectiveness? NO. Since, we need to select the best choice, we can keep this until we find a better choice Incorrect

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters. Again the reasoning is similar to the above. Additionally, we don't know the ratio between high and lower income drivers. With out ehough or strong evidence this choice doesn't raise serious doubts on the effectiveness Incorrect

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative. This is supporting the argument, strengthing it Incorrect

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. Correct Most >50% congestion is caused by commercial vehicles, which don't the capability to carpool. If this were the case, then even if drivers car pool it's not going to reduce the traffic so much. This choice is much better than choice A

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures. Irrelevant This is more in the lines of consequences than about the plan itself Incorrect
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The answer should be D here because if most traffic congestion is due to bigger vehicles which cannot make use of the tax benefit, then the effectiveness of the plan is definitely weakened.
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­Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives.
Assumption - The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

To evaluate the ineffectiveness of the city's carpooling initiative in reducing traffic congestion, we need to check whether traffic congestion was really happening because of single-occupancy vehicles or is there any other reason.

Lets evaluate each option -
 
(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling. Keep - This suggests significant number of drivers might not participate in the carpooling initiative - Hold on to this. 

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters. - This will affect the participation of but it doesn't directly challenge the overall reduction in single-occupancy vehicles. - Side tracking option.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative. - This is also side track option, introducing another alternative plan but doesnt really affect the effectiveness of carpooling.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. - Correct - This option suggests that the main source of traffic congestion is commercial vehicles, which would not be influenced by carpooling incentives. If true, directly challenging the initiative.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures. - Irrelevant - Are we really concerned about cost division? No we are not irrelevant option.

Between A and D.
D Stands out the Best. If commercial vehicles are the main contributors to traffic congestion and which are not affected by carpooling incentives, then the initiative will not significantly reduce overall traffic volume.

I think answer is D.
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Keep close eye on what's claimed to be reduced: Traffic volume (NOT Congestion)


So D can be eliminated.

Ans.A

Posted from my mobile device
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Bunuel
­Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion?

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.



­
 


This question was provided by GMAT Club
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­
­Let's evaluate each option, while keeping in mind that we are looking for an option that most strongly raises a doubt about the plan's effectiveness to reduce overall traffic volume:

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

-> This implies that the plan won't be perfectly effective because a lot of drivers still won't carpool, but as it isn't all drivers, this implies the plan will still reduce overall traffic volume to a certain extent.

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.

-> This is talking about a "potential" issue, and isn't the most serious doubt as implies the plan will still reduce overall traffic volume to a certain extent.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.

-> This is an alternative method to get the same result (to reduce overall traffic volume) but it doesn't raise a doubt on the plan's effectiveness.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

-> This strongly challenges the assumption that reducing single-occupancy vehicles will reduce traffic volume because based on this, traffic volume is NOT caused by single-occupancy vehicles so a plan that targets them and enables more carpooling will not be effective. This is the correct answer.

(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.

-> This is a financial concern and doesn't talk about reducing overall traffic volume through carpooling.

The correct answer is D
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