问题详情

In Ins research, Gerald Wilde finds that technological advances and increases in safety standards ______.
A．have achieved no effect in reducing the number of deaths
B．have helped to solve the problem of so high death rate
C．have oddly accounted for mortality rates in the past century
D．have reduced mortality rates for violent and accidental deaths请帮忙给出正确答案和分析，谢谢！