The head restraint is designed to your head in a crash; it is not a head rest.
a. catch
b. propel
c. straighten
d. inflate

A.catch because the others dont restrain your head

The answer for this question would be A. Catch. The reason for this is because in car crash, your body is propelled forward as the car hit the object. So, by catching your head, the head restraint can prevent a broken neck or even death.

Uh whats the