In explaining the "new role" that goose bumps in humans may have acquired, the author assumes which of the following? A. Emotional responses in humans can be triggered by thermoregulatory mechanisms. B. The perceptibility of emotional responses to other humans offers some kind of benefit. C. If human hair were more substantial, goose bumps would not have acquired a new role. D. Goose bumps in animals with feathers, fur, or quills may also be linked to emotional responses. E. In humans, goose bumps represent an older physiological response than flushing.