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unraveled How is D a weakener and how does E strengthen it?
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I don't understand why D wrong is and E is correct.

the argument tells "while removing", asbestos gets disturbed and fibers get released, and this poses risk to health. so asbestos should not be removed.

E is talking about what might happen "after removal", while D says it is inevitable not to disturb the asbestos "while renovating or demolishing", so it will pose risk anyway when it is removed.
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I don't understand why D wrong is and E is correct.

the argument tells "while removing", asbestos gets disturbed and fibers get released, and this poses risk to health. so asbestos should not be removed.

E is talking about what might happen "after removal", while D says it is inevitable not to disturb the asbestos "while renovating or demolishing", so it will pose risk anyway when it is removed.


Hi Eilah and bv8562, I'll give it a shot. We need to strengthen the conclusion that asbestos should not be removed as it poses a health risk. Now, think about it this way, if it is inevitable, then it doesn't matter whether the government should not require removal or not because it's gonna happen anyway, so might as well remove it [How does it matter because by removing, we would make the inevitable happen sooner than later]. But we need to select choice that gives a reason why the removal shouldn't happen. Hence, D weakens the conclusion by saying that government's mandate does not matter in this situation.

Now, it's okay to bring in additional info in weaken questions, i.e "after removal" part. So, E says even after the removal, it poses a risk because there is no guarantee [Crucial point to note] that it won't be disturbed again so it might pose a health risk again in the future and that is not a desirable scenario. Also, asbestos gets disturbed "while removing" but it poses the risk only after it gets disturbed and fibers are released in the environment so it's important what happens after it gets removed.

Hope this clears your doubts.
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Bunuel
Asbestos, an almost indestructible mineral once installed as building insulation, poses no health risk unless the asbestos is disturbed and asbestos fibers are released into the environment. Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers, the government should not require removal of all asbestos insulation.

Which one of the following, if true, most strengthens the argument?

(A) Asbestos poses far less risk to health than does smoking, drug and alcohol abuse, improper diet or lack of exercise.
(B) Asbestos can post a health threat to workers who remove it without wearing required protective gear.
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.
(D) Asbestos is inevitably disturbed by building renovations or building demolition.
(E) Much of the time, removed asbestos is buried in landfills and forgotten with no guarantee that it will not be disturbed again.

A. irrelevant comparison. Does not affect the conclusion.
B. common trap answer that limits the condition. It seems to strengthen the conclusion by saying that Asbestos can pose a health threat to workers, which explains why the government should not remove the substance. However, how about workers who remove the substance with protective gear? I don't know. B is incomplete and questionable.
C. Similar to A, C makes an irrelevant comparison. C does not justify the conclusion.
D. If D is true, whether the government removes the substance or not does not make any change. This will weaken the conclusion. Also, how about in cases where buildings are not renovated or demolished? Questionable.
E. suggests that if the government removed the substance, it may be disturbed. This justifies why the government should not remove the substance. Although this statement is still questionable because of "most of the time" and "no guarantee", E is at least better than B and D, which are highly questionable.
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Bunuel
Asbestos, an almost indestructible mineral once installed as building insulation, poses no health risk unless the asbestos is disturbed and asbestos fibers are released into the environment. Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers, the government should not require removal of all asbestos insulation.

Which one of the following, if true, most strengthens the argument?

(A) Asbestos poses far less risk to health than does smoking, drug and alcohol abuse, improper diet or lack of exercise.
(B) Asbestos can post a health threat to workers who remove it without wearing required protective gear.
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.
(D) Asbestos is inevitably disturbed by building renovations or building demolition.
(E) Much of the time, removed asbestos is buried in landfills and forgotten with no guarantee that it will not be disturbed again.


Hi KarishmaB GMATNinja AjiteshArun

I was down to (C) and (E). I didn't feel good about (C) being a good answer choice, but i had no logical support to choose (E) over (C).
Please shed some light on (C). Below is my understanding of why (C) should be the answer:


Premise: Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers

Conclusion: the government should not require removal of all asbestos insulation.

Quote:
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.

1. If 5 kinds of Asbestos out of 100 kinds are more harmful than others, then (C) does support the conclusion that ''should not require removal of all asbestos insulation'': Though its a bit weak strengthener

2. Even if 95 kinds of Asbestos out of 100 kinds are more harmful than others, (C) supports the conclusion.


Also, one difference i noticed between (C) and (E) is about qualifiers:

(C) SOME
(E) Much of the time

I have noticed several experts saying that, strong qualifiers such as ALL, NONE, MOST, AFEW are a good marker of good strengthening argument. Can i choose (E) over (C) on the basis of qualifiers?
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ashutosh_73
Hi KarishmaB GMATNinja AjiteshArun

I was down to (C) and (E). I didn't feel good about (C) being a good answer choice, but i had no logical support to choose (E) over (C).
Please shed some light on (C). Below is my understanding of why (C) should be the answer:


Premise: Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers

Conclusion: the government should not require removal of all asbestos insulation.

Quote:
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.

1. If 5 kinds of Asbestos out of 100 kinds are more harmful than others, then (C) does support the conclusion that ''should not require removal of all asbestos insulation'': Though its a bit weak strengthener

2. Even if 95 kinds of Asbestos out of 100 kinds are more harmful than others, (C) supports the conclusion.


Also, one difference i noticed between (C) and (E) is about qualifiers:

(C) SOME
(E) Much of the time

I have noticed several experts saying that, strong qualifiers such as ALL, NONE, MOST, AFEW are a good marker of good strengthening argument. Can i choose (E) over (C) on the basis of qualifiers?
Hi ashutosh_73,

Let's look at option E like this: Asbestos (which is "almost indestructible") will definitely release fibers if it is removed from buildings, and if it is removed, much of the time it is buried in landfills and may be disturbed again (again releasing fibers).

Option C tells us that some kinds of asbestos are more dangerous than other kinds when disturbed. In the absence of any other information, this isn't as convincing as option E. For example, are these "some kinds of asbestos" used in buildings as insulation?
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ashutosh_73
Hi KarishmaB GMATNinja AjiteshArun

I was down to (C) and (E). I didn't feel good about (C) being a good answer choice, but i had no logical support to choose (E) over (C).
Please shed some light on (C). Below is my understanding of why (C) should be the answer:


Premise: Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers

Conclusion: the government should not require removal of all asbestos insulation.

Quote:
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.

1. If 5 kinds of Asbestos out of 100 kinds are more harmful than others, then (C) does support the conclusion that ''should not require removal of all asbestos insulation'': Though its a bit weak strengthener

2. Even if 95 kinds of Asbestos out of 100 kinds are more harmful than others, (C) supports the conclusion.


Also, one difference i noticed between (C) and (E) is about qualifiers:

(C) SOME
(E) Much of the time

I have noticed several experts saying that, strong qualifiers such as ALL, NONE, MOST, AFEW are a good marker of good strengthening argument. Can i choose (E) over (C) on the basis of qualifiers?
Hi ashutosh_73,

Let's look at option E like this: Asbestos (which is "almost indestructible") will definitely release fibers if it is removed from buildings, and if it is removed, much of the time it is buried in landfills and may be disturbed again (again releasing fibers).

Option C tells us that some kinds of asbestos are more dangerous than other kinds when disturbed. In the absence of any other information, this isn't as convincing as option E. For example, are these "some kinds of asbestos" used in buildings as insulation?

Hi AjiteshArun
I am sorry, i didn't understand:

Quote:
Option C tells us that some kinds of asbestos are more dangerous than other kinds when disturbed. In the absence of any other information, this isn't as convincing as option E. For example, are these "some kinds of asbestos" used in buildings as insulation?

(C) says, ''Some kinds of asbestos, when disturbed'' so option is saying that these are the same kind of Asbestos used in the building, no?

Also, conclusion says: Gov, shouldn't remove ALL Asbestos, and (C) seems to say that YES Gov shouldn't remove ALL, because SOME are very dangerous than others. Hence it strengthens.

Only way, i find E better than C is in terms of qualifier. Except the qualifier, all seems equal.
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Bunuel
Asbestos, an almost indestructible mineral once installed as building insulation, poses no health risk unless the asbestos is disturbed and asbestos fibers are released into the environment. Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers, the government should not require removal of all asbestos insulation.

Which one of the following, if true, most strengthens the argument?

(A) Asbestos poses far less risk to health than does smoking, drug and alcohol abuse, improper diet or lack of exercise.
(B) Asbestos can post a health threat to workers who remove it without wearing required protective gear.
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.
(D) Asbestos is inevitably disturbed by building renovations or building demolition.
(E) Much of the time, removed asbestos is buried in landfills and forgotten with no guarantee that it will not be disturbed again.


Premises:
Asbestos poses no health risk unless disturbed and fibers released
Removing asbestos from buildings disturbs it and releases fibers

Conclusion:
The government should not require removal of all asbestos insulation.

We need to support the conclusion.

(A) Asbestos poses far less risk to health than does smoking, drug and alcohol abuse, improper diet or lack of exercise.
Irrelevant. No comparison with other risky behaviour is being discussed.

(B) Asbestos can post a health threat to workers who remove it without wearing required protective gear.
Nothing says that workers remove it without wearing proper gear.

(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.
Kinds of asbestos are not being discussed. The general properties of all asbestos are being discussed. No comparison is being made between different kinds.

(D) Asbestos is inevitably disturbed by building renovations or building demolition.
If anything, this option supports the removal of asbestos now but saying anyway, it will cause whatever damage it has to later too. Hence, it is against our conclusion.

(E) Much of the time, removed asbestos is buried in landfills and forgotten with no guarantee that it will not be disturbed again.
Supports that we should not remove asbestos from buildings. Once we remove, it will cause disturbance. Then we will put it in landfills and there it could be disturbed again and again. Hence, removal could only lead to repeated disturbance and hence more and more harm. If it is left in the buildings undisturbed, it is not harming anyone. So it supports not removing asbestos from buildings.

Answer (E)
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ashutosh_73
(C) says, ''Some kinds of asbestos, when disturbed'' so option is saying that these are the same kind of Asbestos used in the building, no?
Hi ashutosh_73,

Are you reading the once in "an almost indestructible mineral once installed as building insulation" as "in the past" or as "after being"? The argument doesn't say that only asbestos used in buildings can be disturbed. It says that removing asbestos from buildings is ~one way to disturb it.

Also, it's okay if you find that E is better than C. That's perfectly acceptable in strengthen/weaken questions.
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