单项选择题
A．reduces road accidents by more than half B．saves lives while driving at a speed up to 30 miles per hour C．reduces the death rate in traffic accidents D．saves more than 15,000 lives each year
A．make the front seat passengers wear a seat belt B．make the front seat children under 14 wear a seat belt C．stop children riding in the front seat D．wear a seat belt each time he drives