Question ID:PT37 S4 Q25 Passage:In ancient Mesopotamia, prior to 2900 B.C., wheat was cultivated in considerable quantities, but after 2900 B.C. production of that grain began to decline as the production of barley increased sharply. Some historians who study ancient Mesopotamia contend that the decline in wheat production was due to excessive irrigation, lack of drainage, and the consequent accumulation of salt residues in the soil. Stem:Which one of the following, if true, most helps to support the historians' contention concerning the reasons for the decline in wheat production in ancient Mesopotamia? Correct Answer Choice:BChoice A:The cultivation of barley requires considerably less water than does the cultivation of wheat. Choice B:Barley has much greater resistance to the presence of salt in soil than does wheat. Choice C:Prior to 2900 B.C., barley was cultivated along with wheat, but the amount of barley produced was far less than the amount of wheat produced. Choice D:Around 2900 B.C., a series of wheat blights occurred, destroying much of the wheat crop year after year. Choice E:Literary and archaeological evidence indicates that in the period following 2900 B.C., barley became the principal grain in the diet of most of the inhabitants of Mesopotamia.