求助prep上的一题

Traces of cultivated emmer wheat have been found
among the earliest agricultural remains of many archaeological 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.

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

(A) The present-day distribution of another wild wheat, einkorn, which was also domesticated early in
the development of agriculture, covers a much larger area of southwest Asia.

(B) Modern experiments show
that wild emmer wheat can easily be domesticated so as to yield nearly as well
as traditionally domestic strains.

(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.

(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.

(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.

选d

题目中说野生emmer小麦长在那个地方，最古老的cultivated的emmer小麦也长在那个地方然后就得出结论说在那个地方是第一次种植的（前面的cultivated和后面的domesticated是一个意思吗？）当中有个逻辑漏洞，为什么用d来填补？

d说在有农业之前生长野生emmer小麦的地方的气候条件几乎没什么变化。

不明白。