According to the NHTSA, the combination of _______ and ________ reduce the risk of serious crash-related head injury by 83 percent.

According to the NHTSA, the combination of _______ and ________ reduce the risk of serious crash-related head injury by 83 percent.

(A) skilled drivers, cell phones
(B) softer dashboards, headrests
(C) anti-lock brakes, door locks
(D) front air bags, seat belts

According to the NHTSA, the combination of front air bags and seat belts reduce the risk of serious crash-related head injury by 83 percent.