Which of the following is NOT an assumption that Gall makes regarding the relation between a person's aptitude and personality traits, and that person's brain? A. Each bump in the skull corresponds to a distinct part of the brain, which is responsible for a personality trait. B. The more a person develops a certain ability the more an area of that person's skull will protrude. C. There are certain personality traits that do not manifest themselves in the shape of a person's skull. D. One can judge a person's character simply by looking at the shape of the person's skull. E. The diseased brain lends no useful insight into a person's typical behavior.