In American society young people ______.

A．safety regulations effectively prevent the accidents at work
B．with all the safety precautions, accidents at work cannot be avoided
C．the human error or misjudgment leading to accidents at work is mainly due to working environment
D．both B and C

A．car accidents are mainly caused by some drivers who drive so carelessly that they break the traffic regulations
B．car accidents are mainly caused by ordinary drivers when they are careless or absent-minded for a moment
C．insurance companies support those who drive carelessly
D．an accident is something we cannot predict to avoid