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I think its C and B

C
Roughly half a dozen other species of cattle went extinct alongside the auroch.
This says there's some common disease and not hunting or displacement.

B
Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
This says "but the disease what you're claiming can only in the late 1600s whereas the extinction happened in the first half.
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The auroch’s in Eastern Europe went extinct during a time period wherein trade between Asia and Easter Europe was weaker than it had been during earlier periods wherein they thrived. -> Irrelevant for both of them, we aren't concerned about the whether the trade was weak or strong

Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s. -> This supports Junko since it goes completely against what Janet says, i.e. "The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s" and "Something else must have led to the auroch’s extinction, and the best candidate is rinderpest – a disease inadvertently introduced into the auroch’s ecosystem through the import of domesticated cattle from Asia." Since they were imported at the end of 1600, they can't cause the spread of disease in first half of 1600s. 

Roughly half a dozen other species of cattle went extinct alongside the auroch. -> So what? we aren't concerned about others here, nor the scholars

Records from that era show that aurochs were very hard to hunt. -> This kinda supports Janet since this strenghts the claim that they wouldn't have died because of hunting and there should be some other reason. 

Several wild animals larger than the aurochs also went extinct during the 1600s.­ -> Once again, so what?, we aren't concerned about others here, nor the scholars
 
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Janet assertion is strengthen by other evidence provided but the historians, Junko disbelief also is strengthen by the evidence of the fact other species went extinct during the time period

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­Janet: The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s. As the records of the period show that their extinction occurred during a period of stagnation in local population growth, it is unlikely that they were hunted to extinction or died due to habitat displacement. Something else must have led to the auroch’s extinction, and the best candidate is rinderpest – a disease inadvertently introduced into the auroch’s ecosystem through the import of domesticated cattle from Asia.

Junko: That argument is unlikely to convince scholars on its own. Can you cite any other evidence in its favor?

best strengthens Janet’s assertion :Records from that era show that aurochs were very hard to hunt.


best strengthens Junko’s disbelief regarding Janet’s assertions : Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
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For Janet, the answer is, Records from that era show that aurochs were very hard to hunt.
It is so because, while the first 2 somehow weaken the argument, the 3rd and last option really doesn't show any relation between aurochs' extinction. So what if other species became extinct too? Will it be necessarily for the same reason...NO.
For Junko, the answer is, Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
This is so bcoz Janet argues that they became extinct in the first half of 1600s due to import of asian cattles, while according to this argument...the cattles were imported in the late 1600s
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­Janet: The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s. As the records of the period show that their extinction occurred during a period of stagnation in local population growth, it is unlikely that they were hunted to extinction or died due to habitat displacement. Something else must have led to the auroch’s extinction, and the best candidate is rinderpest – a disease inadvertently introduced into the auroch’s ecosystem through the import of domesticated cattle from Asia.

Junko: That argument is unlikely to convince scholars on its own. Can you cite any other evidence in its favor?

Select Janet for the statement that, if true, best strengthens Janet’s assertion, and select Junko for the statement that, if true, best strengthens Junko’s disbelief regarding Janet’s assertions. Make only two selections, one in each column.

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­Here, we must find a statement that strengthens Janet's assertion that rinderpest from domesticated cattle led to the auroch's extinction and one that strengthens the disbelief for Junko. Let's evaluate each option:

1) The auroch’s in Eastern Europe went extinct during a time period wherein trade between Asia and Easter Europe was weaker than it had been during earlier periods wherein they thrived.

-> This would weaken Janet's argument as it means the chances of disease introduction was reduced. 

2) Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
        
-> This would strongly strengthen Junko's disbelief as the domesticated cattle were imported AFTER the aurochs were extinct. This is the best option for Junko.

3) Roughly half a dozen other species of cattle went extinct alongside the auroch.

-> This would strengthen Janet's argument as it shows that other species of cattle were also affected around the same time. A cattle disease being introduced would seem more likely with this argument. This is the best option for Janet.
        
4) Records from that era show that aurochs were very hard to hunt.
        
-> This would support a statement that Janet already pointed out, and is not "other evidence" as to rinderpest being the cause of extinction.

5) Several wild animals larger than the aurochs also went extinct during the 1600s.

-> This is not relevant to the claim about rinderpest, and animals have gone extinct throughout many eras for unrelated reasons so this is irrelevant.

Janet: Roughly half a dozen other species of cattle went extinct alongside the auroch.
Junko: Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.­
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­Answer Janet: Records from that era show that aurochs were very hard to hunt.
That would strengthen her arguement that the extinction must have come from something else than hunting.
Answer Junko: Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
This totally contradicts the reason for the extinction given by Janet, as she said the aurochs went extinct in the first half of the 16th century.
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Janet - Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s. // Shows the relation with time and history which is known to historians.

Junko- The auroch’s in Eastern Europe went extinct during a time period wherein trade between Asia and Easter Europe was weaker than it had been during earlier periods wherein they thrived. // Directly negates the fact presented by Janet.
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­Janet: The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s. As the records of the period show that their extinction occurred during a period of stagnation in local population growth, it is unlikely that they were hunted to extinction or died due to habitat displacement. Something else must have led to the auroch’s extinction, and the best candidate is rinderpest – a disease inadvertently introduced into the auroch’s ecosystem through the import of domesticated cattle from Asia.

Junko: That argument is unlikely to convince scholars on its own. Can you cite any other evidence in its favor?

Select Janet for the statement that, if true, best strengthens Janet’s assertion, and select Junko for the statement that, if true, best strengthens Junko’s disbelief regarding Janet’s assertions. Make only two selections, one in each column.

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­The auroch’s in Eastern Europe went extinct during a time period wherein trade between Asia and Easter Europe was weaker than it had been during earlier periods wherein they thrived.
The statement doesn't add any meaning to either Janet or Juno's claims. 
Eliminate. 

Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
If Asian domesticated cattle were first imported in late 1600s, then the disease from them which led to extinction of aurochs, cited to be in early 1600s, could not be the cause of extinction. Hence Junko saying that it will not convince scholars is true.
So it best strengthens Juno's assertion.

Roughly half a dozen other species of cattle went extinct alongside the auroch.
We are not concerned with other species of cattle.
Eliminate.

Records from that era show that aurochs were very hard to hunt.
This supports Janet's statement that aurochs were hunted to extinction.
So it best strengthens Janet's assertion.

Several wild animals larger than the aurochs also went extinct during the 1600s.
Does not matter for either person statement. We are not concerned with other wild animals.
Eliminate.
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Janet:
Roughly half a dozen other species of cattle went extinct alongside the auroch.

Reasoning: This statement suggests that a common cause (such as a disease like rinderpest) affected multiple species, which would support Janet's argument that rinderpest was the cause of the auroch's extinction.
Junko:
Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.

Reasoning: This directly contradicts Janet's timeline and weakens her argument by suggesting that rinderpest could not have been introduced to the aurochs' ecosystem during their extinction period.

Ans E, B
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The statement "­Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s" implies that wild auroch went extinct in first half of 1600's which was much before Asian domesticated cattle were first introduced to the region. Hence Asian domesticated cattle were not the reason behind extinction of wild auroch. Hence this statement strengthens Junko’s disbelief.

The statement "Records from that era show that aurochs were very hard to hunt" rules out the possibility that human hunting as the reason behind wild auroh's extinction. Which strengthens Janet’s assertion.
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Janet: wild auroch extinction occurred not because of hunting/habitat displacement but possibly because of (introduction of) rinderpest, through import.
Junko: Not convincing enough; cite another evidence.

Option A: If auroch could thrive during earlier periods of stronger trade between Asia and Eastern Europe, then it becomes tough to believe that auroch went extinct during a period of weaker trade between the two. Strengthens Junko
Option B: If cattle were imported in the late 1600s then they were late because by the time auroch would have disappeared.
Option C: in which period? Irrelevant
Option D: This strengthens Janet's reason that hunting did not lead to the extinction. Moreover, auroch was a wild species thus this option makes sense to conclude that even if they were hunted, though very few, that smaller % would not lead to extinction. Strengthens Janet
Option E: Gives a possible reason that yes wild auroch would have disappeared during the 1600s.
1) Janet states they disappeared during the 'first half of the 1600s' thus, the scope of our passage is limited to that; the entire 1600s is out of scope.
2) Both disagree about the possible reasons of extinction; nobody disagrees about whether auroch went extinct.
Thus, E is irrelevant.

Therefore, Janet: Option D and Junko: Option A
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Bunuel
­Janet: The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s. As the records of the period show that their extinction occurred during a period of stagnation in local population growth, it is unlikely that they were hunted to extinction or died due to habitat displacement. Something else must have led to the auroch’s extinction, and the best candidate is rinderpest – a disease inadvertently introduced into the auroch’s ecosystem through the import of domesticated cattle from Asia.

Junko: That argument is unlikely to convince scholars on its own. Can you cite any other evidence in its favor?

Select Janet for the statement that, if true, best strengthens Janet’s assertion, and select Junko for the statement that, if true, best strengthens Junko’s disbelief regarding Janet’s assertions. Make only two selections, one in each column.

­
 


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­Since we're trying to find an argument to support Junko's disbelief, we need to find a weak link between Janet's argument that the extinction was caused by cattles imported from Asia within the cited period which is first half of 1600s.
So "Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s." would be chosen for Junko as it shows Asian cattles cannot have caused it in the first half of 1600s as they didn't even exist then. 
For Janet, we can find grounds to support that extinction via disease is the only possibility. So "Records from that era show that aurochs were very hard to hunt." is a showing that if they were not easily hunted to extinction then the possibility that they went extinct via disease is stronger. 
 
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A) implies that If trade was weaker during the extinction period, this may suggest that the disease could have been introduced in the late 1600s, supporting Janet's idea that rinderpest was a possible cause of extinction. However, it does not directly strengthens

B) decent choise supporting Janet's arg

C) Supports Janet’s argument that disease from cattle could have been a widespread cause of extinction.

D) mild choice that supports Janet’s claim that hunting was not likely the cause of extinction

E) not as good choice supporting either as other choices

Janet=C
Junko=A
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 Roughly half a dozen other species of cattle went extinct alongside the auroch.This supports the Janet's claim the most. ­This shows that the event had something to do with cattles during the exact same time when trades must've happened. 
Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
If cattle were imported after the extinction event had occured, it raises serious doubts regarding Janet's claim. 
 ­
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1. ­"The wild auroch was a species of large wild cattle whose last known herd went extinct in Eastern Europe in the first half of the 1600s."
Most historians agree that Asian domesticated cattle were first imported to Eastern Europe in the late 1600s.
If the cattle was imported after Auroch went extinct then definitely Asian domesticated cattle had no role to play. This can be used in Junko's favour.

2. "it is unlikely that they were hunted to extinction or died due to habitat displacement."
We need something that strengthens this claim.
Records from that era show that aurochs were very hard to hunt.
This makes Janet's claim believable that something else must have led to the auroch’s extinction, and the best candidate is rinderpest.
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The auroch’s in Eastern Europe went extinct during a time period wherein trade between Asia and Easter Europe was weaker than it had been during earlier periods wherein they thrived.
This argument strengthens JUNKO's idea as the trade was weaker and hence it was unlikely that any Asian Cattle was imported to Europe.

Records from that era show that aurochs were very hard to hunt.
This statement strengthens Janet's idea that aurochs went extinct not because of predators of human hunting.
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