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Bunuel
Vicente: Off-road vehicles should be prohibited in our province's main wilderness park. In the past decade, the park's bird populations have declined substantially. This decline is probably attributable, at least in part, to off-road vehicle use. The number of off-road vehicles has been increasing steadily. Their use disrupts sensitive bird habitats.

In Vicente's argument, the two portions in boldface play which of the following roles?

A. The first is a conclusion for which support is offered, and itself is offered to support the second; the second is the main conclusion drawn in the argument.
B. The first is a premise offered to support the second; the second is a conclusion drawn in the argument but not the main conclusion.
C. The first is a premise offered to support the only conclusion drawn in the argument; so is the second.
D. The first is the main conclusion drawn in the argument; the second is another conclusion for which support is offered, and itself is offered to support the first.
E. The first is a conclusion drawn in the argument but not the main conclusion; the second is a premise offered to support the first.
Structure of the argument


  • Off-road vehicles should be prohibited in our province's main wilderness park. → Main conclusion of the argument
  • In the past decade, the park's bird populations have declined substantially. → Premise
  • This decline is probably attributable, at least in part, to off-road vehicle use. → Intermediary conclusion in line with the main conclusion
  • The number of off-road vehicles has been increasing steadily. → Premise.
  • Their use disrupts sensitive bird habitats. → Premise

Answer choice elimination

A. The first is a conclusion for which support is offered, and itself is offered to support the second; the second is the main conclusion drawn in the argument.

The first part of the option isn't an issue. The second premise provides support to the first boldface. The second part is problematic. The second boldface is not the main conclusion.

Hence, we can eliminate this option.

B. The first is a premise offered to support the second; the second is a conclusion drawn in the argument but not the main conclusion.

The first part of this option is incorrect. The second boldface supports the first, not vice versa. The second is a premise and not a conclusion. We can eliminate this option.

C. The first is a premise offered to support the only conclusion drawn in the argument; so is the second.

We have seen that the argument has two conclusions, one main and one intermediary conclusion. Hence, this is incorrect.

D. The first is the main conclusion drawn in the argument; the second is another conclusion for which support is offered, and itself is offered to support the first.

The first part is an intermediary conclusion and not the main conclusion. Hence, that part is incorrect. The second part is also incorrect. The second boldface is a premise and we don't have any support provided in the argument for that. Hence, we can eliminate this.

E. The first is a conclusion drawn in the argument but not the main conclusion; the second is a premise offered to support the first.

Both parts of this option are correct.

The first is an intermediary conclusion in line with the main conclusion, hence the first part is correct.

The second part is a premise that supports the first boldface. We can say that Since the use of off-road vehicles disrupts sensitive bird habitats, therefore the decline of the park's bird populations is probably attributable, at least in part, to off-road vehicle use.

Hence, the second boldface offers to support the first bold face.

Option E
­Structure of the argument
  • Off-road vehicles should be prohibited in our province's main wilderness park. → Main conclusion of the argument
  • In the past decade, the park's bird populations have declined substantially. → Premise > I think this is more like a fact, not premise ? (premise is something like assumption ?)
  • This decline is probably attributable, at least in part, to off-road vehicle use. → Intermediary conclusion in line with the main conclusion
  • The number of off-road vehicles has been increasing steadily. → Premise. > This is also a fact ?
  • Their use disrupts sensitive bird habitats. → Premise
English is not my native language so I may confused a bit. 
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Vicente: Off-road vehicles should be prohibited in our province's main wilderness park. In the past decade, the park's bird populations have declined substantially. This decline is probably attributable, at least in part, to off-road vehicle use. The number of off-road vehicles has been increasing steadily. Their use disrupts sensitive bird habitats.

To me it seems that the last sentence also supports the main conclusion in the argument. It makes sense to say that Off-road vehicles should be prohibited in our province's main wilderness park because increased use of off-road vehicles disrupts sensitive bird habitats. So, both the boldfaces are supporting the main conclusion directly?

I am not able to understand how the last two sentences are supporting the IC - 3rd bold faced sentence? To me it looks like two non-bolded sentences are supporting the two bold faced arguments which in turn are supporting the main conclusion -1st line in the sentence.

GMATNinja karishma @E-GMAT marty chiranjeev

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Vicente: Off-road vehicles should be prohibited in our province's main wilderness park. In the past decade, the park's bird populations have declined substantially. This decline is probably attributable, at least in part, to off-road vehicle use. The number of off-road vehicles has been increasing steadily. Their use disrupts sensitive bird habitats.

To me it seems that the last sentence also supports the main conclusion in the argument. It makes sense to say that Off-road vehicles should be prohibited in our province's main wilderness park because increased use of off-road vehicles disrupts sensitive bird habitats. So, both the boldfaces are supporting the main conclusion directly?

I am not able to understand how the last two sentences are supporting the IC - 3rd bold faced sentence? To me it looks like two non-bolded sentences are supporting the two bold faced arguments which in turn are supporting the main conclusion -1st line in the sentence.
While it's certainly true that both bold sentences support the main conclusion, the real question is whether that first bold functions more as a supporting premise (a fact-type thing) or a supporting sub-conclusion (an opinion or prediction.)

It's the non-committal language of the first bold - "The decline is probably attributable" - that indicates we're looking at a sub-conclusion. We already know that the bird's population has declined. Now we get a hypothesis about the culprit for this decline. Does this hypothesis support the main conclusion? Sure. But it's still it's own kind of sub-conclusion, because it's an opinion. The writer believes this is "probably" true.

So that's why the first piece is a conclusion.

The second statement is an explanation for the hypothesis. Why do we think it's the off-road vehicle use that's causing the population decline? Because this use is disrupting bird habitats. Notice, now, that we don't get a word like "probably," in the second statement. It's given as a fact. So this is a premise in support of the sub-conclusion, which is itself in support of the main conclusion.

I hope that clears things up!
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Chose E over D bcs the main conclusion is the first sentence of the argument
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Quote:
Vicente: Off-road vehicles should be prohibited in our province's main wilderness park. In the past decade, the park's bird populations have declined substantially. This decline is probably attributable, at least in part, to off-road vehicle use. The number of off-road vehicles has been increasing steadily. Their use disrupts sensitive bird habitats.

In Vicente's argument, the two portions in boldface play which of the following roles?

A. The first is a conclusion for which support is offered, and itself is offered to support the second; the second is the main conclusion drawn in the argument.
B. The first is a premise offered to support the second; the second is a conclusion drawn in the argument but not the main conclusion.
C. The first is a premise offered to support the only conclusion drawn in the argument; so is the second.
D. The first is the main conclusion drawn in the argument; the second is another conclusion for which support is offered, and itself is offered to support the first.
E. The first is a conclusion drawn in the argument but not the main conclusion; the second is a premise offered to support the first.

Premise: In the past decade, the park’s bird populations have declined substantially.
Premise: The number of off-road vehicles has been increasing steadily.
Premise: The use of off-road vehicles disrupts sensitive bird habitats.
Intermediate conclusion: The decline in bird populations is probably attributable to off-road vehicle use.
Main conclusion: Off-road vehicles should be prohibited in the main wilderness park.

As you can see, the first bold portion is the argument’s intermediate conclusion, and the second bold portion is a supporting premise for that intermediate conclusion.

A. The first part could be fine, but it doesn’t support the second bold portion, and the second bold portion definitely isn’t the main conclusion of the argument.
B. The first part doesn’t support the second part, but the other way around, and the second portion isn’t a conclusion.
C. No, there are two conclusions in this argument.
D. The first is not the main conclusion, and the second isn’t any sort of conclusion, though it does support the first.
E. Both parts of this one match.
Best answer is E.
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Vicente: Off-road vehicles should be prohibited in our province's main wilderness park. In the past decade, the park's bird populations have declined substantially. This decline is probably attributable, at least in part, to off-road vehicle use. The number of off-road vehicles has been increasing steadily. Their use disrupts sensitive bird habitats.

In Vicente's argument, the two portions in boldface play which of the following roles?

A. The first is a conclusion for which support is offered, and itself is offered to support the second; the second is the main conclusion drawn in the argument.
B. The first is a premise offered to support the second; the second is a conclusion drawn in the argument but not the main conclusion.
C. The first is a premise offered to support the only conclusion drawn in the argument; so is the second.
D. The first is the main conclusion drawn in the argument; the second is another conclusion for which support is offered, and itself is offered to support the first.
E. The first is a conclusion drawn in the argument but not the main conclusion; the second is a premise offered to support the first.

Here is a 2 minute video on this question: https://youtu.be/Yt-Voq6Ljf0
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GMATNinja KarishmaB - Premise usually means evidence in RC then how come second bold face is a premise? Isn't it a conclusion or claim?
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GMATNinja KarishmaB - Premise usually means evidence in RC then how come second bold face is a premise? Isn't it a conclusion or claim?
Look at the logical role the statement is playing. It is supporting "This decline is probably attributable, at least in part, to off-road vehicle use."
Hence it is acting as a premise (supporting another statement). Whether it is technically a fact or not, we can't say. We need to take it to be true. Looking at a statement in isolation, can we differentiate between a fact or a claim? e.g. "The universe is infinite." - Is it a fact or a claim made by scientists? Focus on the role of each statement.
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