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We need to select a statement which strengthens the fact that despite the benefits of green roofing (low temperature and energy saving), the widespread adoption of green roofs has been slow.

A - It weakens the argument since sufficient number of labourers makes it easier and cheaper to get it installed.
B - It does not necessarily support the argument as we dont have sufficient information to determine the effect.
C - It weakens the argument since it gives additional incentive and makes it cheaper to get it installed.
D - Correct answer. Since the alternative roofing is chepaer and quicker to install people might prefer it over green roofs.
E - t weakens the argument since it gives more reason for people to use green roofing. 
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­Urban Planner: The installation of green roofs in urban areas can reduce the overall city temperature during summer months, thereby reducing the need for air conditioning and energy consumption. However, despite their benefits, the widespread adoption of green roofs has been slow. This is because the initial cost of installing green roofs is considerably high, and because __________.

Which of the following, if true, most logically completes the urban planner’s argument?

(A) there are sufficient numbers of skilled laborers available to install green roofs
(B) green roof materials are often sourced from suppliers who are located far from urban centers
(C) tax incentives for green construction projects are commonly available in urban areas
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time

The stem should conclude with a sentence that logically follows the reasoning of low adoption of green roofs, in this case "initial high cost of installation".

a) opposite as if the number of labours were sufficient it mostly may reduce the cost of installing not increase.

b) unclear as it doesnt clearly address the high cost of greenroofs. can be a trap as it may lead one to assume and factor in the transportation costs

c) opposite

d) correct. provides the best reasoning for low adoption as people will generally go for a cheaper alternative

e) opposite
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Bunuel
­Urban Planner: The installation of green roofs in urban areas can reduce the overall city temperature during summer months, thereby reducing the need for air conditioning and energy consumption. However, despite their benefits, the widespread adoption of green roofs has been slow. This is because the initial cost of installing green roofs is considerably high, and because __________.

Which of the following, if true, most logically completes the urban planner’s argument?

(A) there are sufficient numbers of skilled laborers available to install green roofs
(B) green roof materials are often sourced from suppliers who are located far from urban centers
(C) tax incentives for green construction projects are commonly available in urban areas
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time



­
 


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­Prethinking: Here as the blank is after the word "because" we can assume that the answer will be a premises which will help us justify the conclusion which is that the widspread adoption is slow despite the benefits. 

(A) there are sufficient numbers of skilled laborers available to install green roofs. This is a counter premises, it weakens the conclusion 
(B) green roof materials are often sourced from suppliers who are located far from urban centers. Does far situated means that the adoption will be slow? No, maybe they have good logictics facilities. Thus we can crooss this option.
(C) tax incentives for green construction projects are commonly available in urban areas. This is a counter premises, it weakens the conclusion 
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs. This perfectly alligns with our prethinking. 
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time. This is a counter premises, it weakens the conclusion 
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(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs

This provides more reasons for why adoption of green roofs is slow hence logically completing the argument
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­Here's what was given to us:

The urban planner discusses reasons for the slow adoption of green roofs despite their benefits.
One reason given is the high initial cost of installation. Hence we need to find a second reason that logically completes the argument for why adoption has been slow.Let's look at the options now: 

(A) there are sufficient numbers of skilled laborers available to install green roofs
Availability of skilled laborers would actually make adoption easier, not slower. This doesn't fit. A is out. 

(B) green roof materials are often sourced from suppliers who are located far from urban centers
While this might increase costs, it's not a separate reason from the high initial cost already mentioned. Also, it doesn't directly address the comparison with traditional roofing. Let's hold onto B and see if there's a better choice. 

(C) tax incentives for green construction projects are commonly available in urban areas
Tax incentives would encourage adoption, not slow it down. This contradicts the argument and weakens it. C is out. 

(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs
This provides a strong alternative to green roofs. It tells us why people might choose traditional roofing instead. Notice how it offers both a cost advantage and a time advantage. D looks pretty good to me. 

(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time
This argues favouring green roofs (long-term cost savings), which doesn't explain slow adoption. E is out. 

Therefore, the correct answer is (D).­
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Urban Planner: The installation of green roofs in urban areas can reduce the overall city temperature during summer months, thereby reducing the need for air conditioning and energy consumption. However, despite their benefits, the widespread adoption of green roofs has been slow. This is because the initial cost of installing green roofs is considerably high, and because __________.

We are looking for a reason that shows green roofs aren't adopted.

(A) there are sufficient numbers of skilled laborers available to install green roofs // Eliminate. This is giving a reason to use green roofs.
(B) green roof materials are often sourced from suppliers who are located far from urban centers. //Eliminate because doesn't provide reason to show that why it can't be adopted.
(C) tax incentives for green construction projects are commonly available in urban areas .// Eliminate. This is giving a reason to use green roofs.
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs - Correct.
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time// Eliminate. This is giving a reason to use green roofs.
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(B) green roof materials are often sourced from suppliers who are located far from urban centers
This is the answer
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The answer is B and it seems pretty logical that the answer is B.
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D should be the answer.
B was close but we are not about "green roof materials " but rather concerned about the installation of the green roofs.
Also , we have no idea how developed transportation systems are to transport the green roof materials. B is an immature choice and hence wrong.
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It provides evidence and clarity to the effect of data provided

Posted from my mobile device
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Bunuel
­Urban Planner: The installation of green roofs in urban areas can reduce the overall city temperature during summer months, thereby reducing the need for air conditioning and energy consumption. However, despite their benefits, the widespread adoption of green roofs has been slow. This is because the initial cost of installing green roofs is considerably high, and because __________.

Which of the following, if true, most logically completes the urban planner’s argument?

(A) there are sufficient numbers of skilled laborers available to install green roofs
(B) green roof materials are often sourced from suppliers who are located far from urban centers
(C) tax incentives for green construction projects are commonly available in urban areas
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time



­
 


This question was provided by GMAT Club
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­
­It's listing all the disadvantages of green roofs adoption in urban areas, so A, C and E are eliminated since they are advantages. We're left with B and D. But D is irrelevant since it's not explaining why green roofs are not adopted widely in urban areas but B does. Since the question is asking about what's happening in urban areas. D can be the case for any area. 
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I think D, because B is a rephrasing of the initial (1st) argument by the urban planner and all the other answers go are the urban planner's argument.
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Overall city temp.is reduced because of installation of green roofs in urban areas (Premise), in effect there is reduction in requirement of AC and energy usage also. (Contrasting views now) Although all such benefits, adoption rate of green roof is slow because green roofs initial cost is significantly high and author expects another reason that can reinforce the conclusion that despite benefits, why people are not adopting green roofs.

(A) there are sufficient numbers of skilled laborers available to install green roofs - This option actually does the opposite effect. If adequate skilled labor is available, then, people should adopt the roofs quickly. Hence, it does not justifies the slow adoption of the roofs.

(B) green roof materials are often sourced from suppliers who are located far from urban centers - This option could be potentially true, at first glance. As long distance for green roof materials sourcing, means supplier charges more to people and that could increase the cost. As this high initial cost is already mentioned as a 1st reason for slow adoption. So, this is not correct.

(C) Tax incentives for green construction projects are commonly available in urban areas. - Green roofs (specific)= green construction project (generic), certainly not (i guess). If we consider both same, then tax benefit should increase the green roofs adoption but it does not explain the slow adoption. So incorrect.

(D) Traditional roofing solutions are generally less expensive and quicker to install than green roofs. - This option directly provides another reason, such as cost and swiftness to install green roofs, to justify the slow adoption. so, this is correct.

(E) Green roofs typically last longer than traditional roofing materials, thus potentially saving money over time. - As option A, it does the opposite effect on the conclusion. Hence, incorrect.

Answer is D.­
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Urban Planner: The installation of green roofs in urban areas can reduce the overall city temperature during summer months, thereby reducing the need for air conditioning and energy consumption. However, despite their benefits, the widespread adoption of green roofs has been slow. This is because the initial cost of installing green roofs is considerably high, and because __________.

Which of the following, if true, most logically completes the urban planner’s argument?

We need to find something in continuation of the statement, in the line of the argument that the adoption is low. 

(A) there are sufficient numbers of skilled laborers available to install green roofs -> opposite to our line of thought
(B) green roof materials are often sourced from suppliers who are located far from urban centers -> in line but is not exactly a continuation to the prev point of cost
(C) tax incentives for green construction projects are commonly available in urban areas -> opposite to our line of thought
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs -> in line and in continuation to the prev point of cost
(E) green roofs typically last longer than traditional roofing materials, thus potentially saving money over time­ -> opposite to our line of thought
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­We need an answer that in a way weakens the whole idea and supports the last statement.
Only choice B leads to this idea and it talks directly about the Green roofs.
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The urban planner argues that green roofs can lower city temperatures and reduce energy consumption but their adoption has been slow due to high installation costs. The explanation highlights that another key reason for the slow adoption is that traditional roofing solutions are generally less expensive and quicker to install than green roofs. This comparison underscores why many opt for traditional roofs despite the environmental benefits of green roofs.
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­I think Option D,
(D) traditional roofing solutions are generally less expensive and quicker to install than green roofs.
This option logically completes the argument by explaining that the high initial cost and slower installation time of green roofs compared to traditional roofing solutions are significant factors in the slow adoption of green roofs.
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