emmer wheat

I choose D

(A) The present – day distribution of another wild wheat, eikorn, which was also domesticated early in the development of agriculture, was a much larger area of southwest Asia. -- another plant is not concerned

(B) modern experiments show that wild emmer wheat can easily be domesticated so as to yield nearly as well as traditionally domestic strains. -- so emmer wheat can be grown easily in many other areas, this is to weaken the statement, wrong


( C) At the time when emmer wheat was first cultivated, it was the most nutritious of all varieties of grain that was then cultivated. -- irrelavent, whether it's the most nutritious or the most beautiful plant does not help to support the statement


(D) In the region containing the strip where wild emmer has been found, climatic conditions have changed very little before the development of agriculture. -- support,


(E) It is very difficult, without genetic testing, to differentiate the wild form of emmer wheat from a closely related wheat that also grows in southwest Asia. -- same reason as C)