Tina Falls While Climbing a Tree and Lands on Her

Multiple Choice

Tina falls while climbing a tree and lands on her back.Her frightened parents take her to the emergency room,where she is examined.Her knee-jerk reflex is normal and she exhibits a plantar reflex (negative Babinski reflex) .These results suggest that Tina has

A) injured one of her descending nerve tracts.
B) injured one of her ascending nerve tracts.
C) a spinal injury in the lumbar region.
D) a spinal injury in the cervical region.
E) suffered no damage to her spinal cord.