Which of the following, if accurate, would most undermine the third paragraph's author's claims?
Clay was the first substance that humanstotally transformed by heating. Soft, doughy clayis remarkable because in a hot kiln or oven, itLinechanges color and becomes a hard,(5)heat-resistant ceramic material that can holdliquids. Along with the discovery that grains couldbe cultivated, the advent of ceramics led to whatsome scientists have called the Neolithic (NewStone Age) Revolution, laying the agricultural(10)basis for the first cities of the ancient world.
A method for creating ceramics was firstdiscovered roughly 26,000 years ago, whenartisans at a site in what is now theCzech Republic mixed clay with loess, rich soil(15)left behind by retreating glaciers, and then fired itin ovens. The discovery of how to produce a ceramic by firing clay was a milestone in humanity's quest to utilize nature. Up to that time, craftspeople had(20)transformed stone, bone, and wood into tools and weapons by altering their shape, not their intrinsic properties. With ceramics produced from clay, humans learned that the physical properties of materials could be dramatically improved. In(25)prehistoric times, as is frequently the case today, most advances involving materials were based on this simple concept.