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For several centuries there have been hairless dogs in wester

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For several centuries there have been hairless dogs in wester  [#permalink]

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New post 14 Aug 2018, 05:17
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E

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  95% (hard)

Question Stats:

34% (01:58) correct 66% (02:00) wrong based on 127 sessions

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For several centuries there have been hairless dogs in western Mexico and in coastal Peru. It is very unlikely that a trait as rare as hairlessness emerged on two separate occasions. Since the dogs have never existed in the wild, and the vast mountainous jungle separating these two regions would have made overland travel between them extremely difficult centuries ago, the dogs must have been transported from one of these regions to the other by boat, probably during trading expeditions.

Which one of the following is an assumption that the argument requires?

A. Hairless dogs have never been found anywhere except in the regions of western Mexico and coastal Peru.

B. Most of the trade goods that came into western Mexico centuries ago were transported by boat.

C. Centuries ago, no one would have travelled between western Mexico and coastal Peru by boat except for the purposes of carrying out a trading expedition.

D. IF hairless dogs were at one time transported between western Mexico and coastal Peru by boat, they were traded in exchange for other goods.

E. Centuries ago, it was easier to travel by boat between western Mexico and coastal Peru than to travel by an overland route.


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Re: For several centuries there have been hairless dogs in wester  [#permalink]

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New post 14 Aug 2018, 12:44
Can any one please help me with what is wrong with option c?
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Re: For several centuries there have been hairless dogs in wester  [#permalink]

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New post 14 Aug 2018, 23:08
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For several centuries there have been hairless dogs in western Mexico and in coastal Peru. It is very unlikely that a trait as rare as hairlessness emerged on two separate occasions. Since the dogs have never existed in the wild, and the vast mountainous jungle separating these two regions would have made overland travel between them extremely difficult centuries ago, the dogs must have been transported from one of these regions to the other by boat, probably during trading expeditions.

Which one of the following is an assumption that the argument requires?

Question Type: Assumption

Premise 1: There are hairless dogs in W. Mexico & coastal Peru. It is unlikely they emerged on two different occasions.

Premise 2: The dogs have never existed in the wild. The vast mountainous region separating the two regions would have made overland travel difficult centuries ago.

Conclusion: The dogs must have been transported from one of these regions to the other by boat.

Argument Analysis - The dogs have emerged in one of the two regions & must have been transported by humans from one region to other & also the dogs have never been in wild. Hence the dogs were domesticated & transported by humans. The two regions are separated by mountains, which make land travel difficult, therefore it may not have been the favorable route for transport for any purpose.
The dogs were transported by boat, since centuries ago, there were only two modes of transport & therefore by water must have been the easier route than by land.


A. Hairless dogs have never been found anywhere except in the regions of western Mexico and coastal Peru. - argument is about transport of the dogs from one region to the other, the existence of dogs in other regions doesn't affect the conclusion. Incorrect.

B. Most of the trade goods that came into western Mexico centuries ago were transported by boat. - We do not know whether the dogs were transported from Peru to W. Mexico. Incorrect

C. Centuries ago, no one would have travelled between western Mexico and coastal Peru by boat except for the purposes of carrying out a trading expedition. - If we reverse this it says "Centuries ago, travel between W. mexico & coastal Peru by boat also existed for other purposes than only for trading expeditions". The conclusion remains unaffected, as the core of the conclusion is based on "transport by boat", the dogs could have been transported by boat by tourists for that matter.

D. IF hairless dogs were at one time transported between western Mexico and coastal Peru by boat, they were traded in exchange for other goods. - Similar to C. if we reverse this it says "Hairless dogs were transported by boat between mexico & peru, for other purposes than to be traded in exchange of goods. The conclusion is unaffected. Incorrect

E. Centuries ago, it was easier to travel by boat between western Mexico and coastal Peru than to travel by an overland route. - If we reverse this it says " It was harder to travel by boat than to travel by land", since it is already hard to travel by land, travel by boat would be then even harder, thus making the conclusion weak & quite unlikely. Hence this is the correct answer, also it fits nicely between the concluding sentence "the vast mountainous jungle separating these two regions would have made overland travel between them extremely difficult centuries ago, it was easier to travel by boat between western Mexico and coastal Peru than to travel by an overland route, therefore the dogs must have been transported from one of these regions to the other by boat, probably during trading expeditions


Answer E.


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Re: For several centuries there have been hairless dogs in wester &nbs [#permalink] 14 Aug 2018, 23:08
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