单选题 Wearing a seat belt in a vehicle ______.

A、 reduces road accidents to 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

【正确答案】 C

【答案解析】[解析] 由第一段最后一句可知，佩带安全带可减少死亡率或重伤率。