Which of the Following Statements Is Not True with Respect

Which of the following statements is not true with respect to head injury?

A) Concussions are caused by direct blows to the head or elsewhere in the body resulting in sudden, turbulent, and mechanical loading of the cerebral hemisphere.
B) Impacts between the cortex and bony walls of the skull can cause immediate and short-lived impairment of neurological function.
C) Signs and symptoms associated with concussions typically do not resolve sequentially.
D) Concussion is most often associated with normal results on conventional neuroimaging studies.