Even in ancient times, specialized farms (farms that grow a single type of crop or livestock) existed only where there were large commercial markets for farm products, and such markets presuppose urban populations. Ttherefore the extensive ruins in the archaeological site at Kadshim are probably the remains of a largely uninhabited ceremonial structure rather than of a densely populated city, since the land in the region of Kadshim could never have supported any farms except mixed farms, which grow a variety of crops and livestock. Which one of the following is an error of reasoning in the argument?
A: drawing a conclusion that is simply a restatement of one of the premises on which the argument is based
B: taking the nonexistence of something as evidence that a necessary precondition for that thing also did not exist
C: taking the fact that something is true of one sample of a class of things as evidence that the same is true of the entire class of things
D: interpreting an ambiguous claim in one way in one part of the argument and in another way in another part of the argument
Choose A, B, C or D as your solution.
B