Recent archaeological findings suggest that an ancient civilization developed an irrigation system that significantly boosted their agricultural productivity. Proponents of this theory argue that the increased food supply allowed the civilization to support a larger population, which in turn led to advancements in various fields, such as science and art. Therefore, it can be concluded that the development of the irrigation system was the primary factor behind this civilization's rapid progress during that period.
Which of the following, if true, most seriously weakens the argument?
(A) The same archaeological findings also reveal evidence of trade routes connecting this ancient civilization to other prosperous civilizations at that time.
(B) The construction materials used in building the irrigation system were not native to the region and were likely imported from distant lands.
(C) A significant portion of the population was involved in agriculture, as indicated by tools and artifacts found at multiple excavation sites.
(D) A majority of advancements in science and art occurred before the construction of the irrigation system, according to carbon dating analysis.
(E) The civilization's rapid progress during that period coincided with a decline in warfare and internal conflict among its people.