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Traces of cultivated emmer wheat have been found among the earliest agricultural remains of many archeological sites in Europe and Asia. The only place where the wild form of emmer wheat has been found growing is a relatively narrow strip of southwest Asia. Since the oldest remains of cultivated emmer wheat yet found are from village sites in the same narrow strip, it is clear that emmer wheat was first domesticated somewhere in that strip.
Conclusion: Emmer wheat was first domesticated in the relatively narrow strip of southwest Asia. Why did the author come to such conclusion? Because the oldest remains of cultivated emmer wheat were found in villages belonging to that strip. How can we strengthen this conclusion?
The clue lies in the very fact that the plant was cultivable in the same strip was because the climatic conditions are the same.
Which of the following, if true, most strengthen the argument?
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(A) The present-day distribution of another wild wheat, einkon, which was also domesticated early in the development of agriculture, covers a much larger area of southwest Asia.
The fact that Einkon(another kind of wild wheat) covers a much larger area does not say anything about Emmer wheat was first domesticated in the relatively narrow strip of southwest Asia.
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(B) Modern experiments show that wild emmer wheat can easily be domesticated so as to yield nearly as well as traditionally domestic strains (a particular type of plant).
The ease of domestication of the wild wheat does not say anything about Emmer wheat was first domesticated in the relatively narrow strip of southwest Asia.
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(C) At the time when emmer wheat was first cultivated, it was the most nutritious of all the varieties of grain that were then cultivated.
Again, Nutritional value of Emmer when it was first cultivated does not explain why it was first cultivated in that narrow strip than anywhere else in the world.
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(D) In the region containing the strip where wild emmer wheat has been found, climatic conditions have changed very little since before the development of agriculture.
Since the climatic conditions of the cultivated wheat are the same as the wild wheat, the cultivated wheat thrived. This gives us high hopes (atleast better than all other options) to trust that, maybe wild Emmer wheat was first domesticated in the relatively narrow strip of southwest Asia.(Also the oldest remains were found there)
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(E) It is very difficult, without genetic testing, to differentiate the wild form of emmer wheat from a closely related wild wheat that also grows in southwest Asia.
This option says nothing about the origin of the first cultivated Emmer wheat. Out of scope.