Ten-year-old Tina falls while climbing a tree and lands on her back. Her frightened parents take her to the local emergency room where she is examined. Her knee jerk reflex is normal and she exhibits a negative Babinski reflex. These results suggest that
A) Tina has injured one of her descending nerve tracts.
B) Tina has injured one of her ascending nerve tracts.
C) Tina has a spinal injury in the lumbar region.
D) Tina has a spinal injury in the cervical region.
E) Tina suffered no damage to her spinal cord.
Answer: E