Stephanie is in a car accident, flung from her vehicle and landing on her back on pavement. At the scene, an emergency medical technician checks her Babinski reflex, in which the great toe extends upward and the smaller toes fan apart. This reflex
A)may indicate aging of the corticospinal tract. B)may indicate an injury to the corticospinal tract. C)is normal in adults. D)is meaningless in assessing an emergency situation.