While studying those couples who got divorced and those who stayed married, all the following factors were included EXCEPT ______

A．the Selby crash happened because the train driver drifted off at the wheel
B．the motoring organization of EU has no doubt about the new awake system
C．about 25 people die each month in Britain in accidents caused by sleepy drivers
D．the patent of the awake system will belong to Mercedes since it carries out the test runs

A．How to Reduce Car Accidents in Europe
B．Vibrating Seats to Save Lives of Dozing Drivers.
C．Awake System—the Best Solution to Car Accidents.
D．Intelligent Cars.