求一道填空题，求指点

jurat911

While it is assumed that the mechanization of work has a _____ effect on the lives of workers, there is evidence available to suggest that, on the contrary, mechanization has served to______ some of the traditional of roles of women.

A. salutary...improve
B. dramatic...undermine
C. benign...revise
D. debilitating...weaken
E. revolutionary...reinforce

我认为排除掉A,C,D选项。剩下的是B和E了，dramatic 和 revolutionary 都可以修饰effect .可是为什么第二处填的是reinforce ，为什么不是undermine;我觉得第二空格填的是负评价词，使消弱妇女的传统地位的东西；
求高手解析并指出我的逻辑错误，非常感谢。。。。。

小桥依梦

assume的是机械化使得工人生活革命性变化，女性地位应该提高，但是on the contrary取反，应该是妇女地位还在traditional 的地位