Which of the following most logically completes the passage?
In cars, airbags provide good protection for the chest and head, but little or no protection for legs. A study of injuries resulting from car accidents showed that a large proportion were caused by blows to the legs. Therefore, if air bags protected this area, the risk of serious injury in car accidents would be greatly reduced, especially since _______________.
【选项】
even those drivers who drive cars with air bags have a poor understanding of the degree and kind of protection that air bags afford
选项是否正确？