Question ID:PT49 S2 Q14 Passage:Scientist:  A controversy in paleontology centers on the question of whether prehistoric human ancestors began to develop sophisticated tools before or after they came to stand upright. I argue that they stood upright first, simply because advanced toolmaking requires free use of the hands, and standing upright makes this possible. Stem:Which one of the following statements, if true, most weakens the scientist's argument? Correct Answer Choice:BChoice A:Many animals that do not stand upright have learned to make basic tools. Choice B:Advanced hunting weapons have been discovered among the artifacts belonging to prehistoric human ancestors who did not stand upright. Choice C:Many prehistoric human ancestors who stood upright had no sophisticated tools. Choice D:Those prehistoric human ancestors who first came to stand upright had no more dexterity with their hands than did those who did not stand upright. Choice E:Many of the earliest sophisticated tools did not require their users to be able to stand upright.