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Stimulus: Tax incentives for carpooling will motivate drivers to share vehicles resulting in reduce traffic congestion.

Option A: Even if small proportion of drivers opt for carpooling plan will be success

Option B: Even if only high-income drivers get the incentive and opt for pooling plan will be success

Option C: Increase in public transport will not sabatoge the plan, on the flip side it's a win-win situation

Option D: If main cause of traffic congestion is commercial vehicles than our plan will fail because it's targetting daily commuters. Hence this will sabotage the plan

Option E: Lost tax revenue may be used for some other traffic measures but it doesn't pose a threat to the existing plan

Posted from my mobile device
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­We need an option to give a solid reason to believe that Urban Planner's Claim to decrease traffic congestion will not yield anticipated results.
Options A and D provide such reasons.
A: Many drivers prefer to travel alone even if they get tax benefit => right, but how many? 2% or 3% or 51% or 99%
If just 2% of drivers do not share then the plan could still work else might not work.

D: Most traffic congestion is due to commercial vehicles => So this straightaway says 51% traffic congestion is due to commercial vehicles will not be sharing space because they just can not.
This surely weakens the conclusion. CORRECT
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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.

(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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I will go with option D

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

If traffic congestion is due to commercial vehicles, then even if there is incentive, overall traffice volume will not decrease.

If we negate the option D, conclusion will collapse.
 
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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?

We need to identify a argument weekner to raise a doubt.

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
This statement generalizes on specific set, while many driver prefer to travel alone other drives can reap the benefits of incentives. Hence this does not help.

(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 statement too specifices on a specific set (lower income commuters), hence does not help.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental iues, regardless of the carpooling initiative.
This statement is out of context from the argument. In any case, this still helps strenghten the argument and not weeken.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
This statement rightly implies that the section which is relevant to causing congestion, wont reap the benefits of carpooling. Hence is ideal answer choice.

(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.
We dont need to no what impace tax incentives will have.
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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.
- If true, this will impact the plan, however, it doesnt most seriously question the effectiveness, as some drivers will still make that shift.
(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
- less participation from a certain income does not mean that traffic congestion won't be reduced
(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
- nothing about public transportation stated in the urban planner's claim, and more public transportation use means reduced congestion
(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
Explanation - the 'most' here highlights the ineffectiveness of the plan, as commercial vehicles make up mahority of the traffic congestion
(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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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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­The conclusion is concerned about decrease in traffic volume regardless of the extent.

A. Even if many drivers prefer riding along, other drivers who follow carpooling will impact the traffic decrease.
B. If lower income drivers are not receiving the incentives then they are not likely to follow carpooling. Even if the tax incentives are provided to higher income drivers, then they might still not follow carpooling because they are in a high income bracket and might not care for the incentives. Keep.
C. Whether or not carpooling will have an effect is in contention. This argument is irrelevant.
D. Even if most traffic is due to commercial vehicles, the remaining traffic which is attributed to private vehicles can still contribute to the reduced traffic through carpooling.
E. Regardless of what it would cost the city, whether the traffic will reduct is the contention. Irrelevant.
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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.
- Ok. Many doesn't mean all. This doesn't affect

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

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


(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
- Yes, this makes sense. What if the congestion is not because of single occupancy vehicles who can car pool. In that case even if everyone signs up for car pooling, it wont change the situation.

(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.
- City Revenue is not discussed in argument

Hence, Option D
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(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 suggests that despite the tax incentives, a significant number of drivers might not change their behavior. If drivers continue to prefer driving alone, the number of single-occupancy vehicles will not decrease, undermining the plan's objective.

(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 indicates that the benefits of the incentives might not be evenly distributed. While it could affect participation rates among certain income groups, it does not directly address the overall reduction in traffic volume.

(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 suggests an alternative solution that may complement the carpooling initiative. It does not directly challenge the effectiveness of carpooling itself but rather highlights another factor influencing traffic patterns.

(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 directly challenges the core assumption of the plan. If commercial vehicles are the main cause of traffic congestion and they cannot participate in carpooling, then the plan will not significantly impact overall traffic volume.

(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 highlights a potential financial drawback of the plan. While it raises a valid concern about resource allocation, it does not directly address whether the carpooling initiative will reduce traffic congestion.

Conclusion:
Option (D) raises the most serious doubt about the effectiveness of the city's plan because it directly addresses the cause of traffic congestion. If commercial vehicles are the primary source of congestion and they cannot be included in the carpooling initiative, then the plan will fail to achieve its intended goal of reducing traffic volume.­
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­The answer should be option 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. (So what, even if 1 driver carpools, overall traffic volume will decrease. OOS)

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters. (We dont know if lower income makes up the most of drivers population)

(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 target the plan)

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. (Yes, is most traffic congestion is due to CVs, then our plan is not intending in right direction. 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. (out of scope)­
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­(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 suggests that the preference for traveling alone may outweigh the incentives, leading to low participation in carpooling. This directly challenges the effectiveness of the plan since it implies that the initiative may not attract enough drivers to significantly 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.


  • While this could lead to unequal participation, it does not necessarily negate the overall reduction in traffic congestion if a significant number of higher-income drivers participate.
(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.


  • Increased use of public transportation is beneficial for reducing traffic congestion and does not necessarily contradict the effectiveness of the carpooling plan. It might even complement it.
(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 presents a serious challenge but the question is concerned with single occupancy veicles but it talks about commercial 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.


  • While this raises concerns about the cost-effectiveness of the plan, it does not directly challenge the assumption that carpooling could reduce traffic congestion if enough drivers participate.
So Ans is A
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The Urban Planner's Claim here is that the plan of reducing overall traffic volume is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease. To answer the question here, it is important to define what an assumption is. An assumption is the crucial unstated logical link between the premise and conclusion and it must be true in order for the argument to be valid. Since the aim is to decrease traffic volume through the reduction of single-occupancy vehicles we need to look at the statement which directly threatens the reduction of single-occupancy vehicles. 

With this information let us go through the answer choices.

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

Even though many drivers prefer to travel alone, that does not mean that the number of single-occupancy vehicles on the roads cannot decrease. How do you define many? Many drivers can prefer to travel alone and at the same time, many drivers can also be tempted by financial incentives and switch to 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.

The words "potentially" and "less participation" are not strong indicators that change is not possible. And even if all single-occupancy high-income drivers switch to carpooling, this would still be considered a win. We do not know the ratio of higher-income drivers to 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.

That is perfectly fine. Public transportation can see and increase as can the carpooling initiative. These two instances are not mutually exclusive. 

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

Here we have an interesting answer choice because the word "most" is used, meaning the vast majority. It states that most vehicles are commercial and they will not be tempted by carpooling incentives because they cannot share vehicle space. Here we have a logistical obstacle as to why carpooling is not possible for commercial vehicles; and since most traffic congestion is due to these vehicles, then we cannot reduce the number of single-occupancy cars.

(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.

We are not concerned with other traffic reduction measures, we care about reducing the number of single-occupancy vehicles. Moreover, we are not talking about opportunity cost and are not concerned with the costs pertaining to the city. 

Therefore the answer is D


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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Option D

Plan - tax incentive to reduce congestion. But it might not work why ? give a new premise

The question is only between 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. - But what is many? i the others remaining carpooling enough to reduce congestion.. idk not strong enough I guess.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. - Yes this premise shows, although people might follow, the congestion reason is something else, so might not be very successful
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we need to look for something that impedes the carpooling initiative to reduce 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.: for this to impede it would have to be most or almost all instead of many

(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 could affect the effectiveness but not necessarily, for example it could be the case that no low-income commuters use single-occupancy vehicle and are already carpooling or using public transport.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.: for this to put in doubt the effectiveness of the initiative the increase in the systems would need to cause a decrease in traffic large enough so that any additional decrease wouldn´t decrease residual congestion.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.: if most traffic isn´t caused by single-occupancy vehicles, reducing them won´t reduce congestion.

(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 could indicate that the initiative isn´t the most economically sensible measure to take but that doesn´t mean it won´t be effective.

answer (D)­
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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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Goal : to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. plan: is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.­

Question: Doubt on effectiveness of 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 causes most doubt on plan effectiveness if drivers do not care on financial incentives and prefer flexibility and privacy more. Hence is the answer

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
-- it doubts the argument but we do not divide between higher income driver vs lower income. If there are more such drivers, plan is successful. If not plan is not successful. hence does not give final view on how it will pan out

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
-- talks about public transportation but not the plan, hence out

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
-- It does not talk about plan rather commercial vehicles as primary driver for congestion. so out 

(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
-- tax incentive will cost money but still plan will help reduce traffic congestion. so how money could have been used for other purpose is outside the scope.

 
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­IMO Option D is the correct answer. 
As per option D, Most traffic congestion is due to commercial vehicles which implies > or = 50% of the traffic is because of commercial vehicles. Since, the new initiative do not concern these, the likelihood that traffic will decrease reduces. This causes the most doubt. 

Option A can be eliminated since 'many' implies > 1. Hence, doesn't cause a doubt 
Options B & E are out of scope as the argument isn't concerned about the drivers distribution nor about tax revenue lost. 
Option C strengthens the argument rather than causing doubt.
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