哪位大虾帮忙看看这题.高人指点啊

戴小真

Teenagers are oftern priced out of the labor market by the government-mandated minimum-wage level because emplyers cannot afford to pay that much for extra help. Therefore, if Congress institutes a subminimum wage, a new lower legal wage for teenagers, the teenage unemployment rate, which has been rising rising since 1960, will no longer increase.

Which of the following, if true, would most weaken the argument above?

A Since 1960 the teenage unemployment rate has risen when the minimum was has risen.

B Since 1960 the teenage unemployment rate has risen even when the minimum wage remained constant.

C Employrs often hire extra help during holiday nd warm weather seasons.

D The teenage unemployment rate rose mre quickly in the 1970's than it did in the 1960's

E The teenage unemployment rate has occasionally declined in the years since 1960

我选了E但是答案是B,我怎么都想不明白啊....

请哪位高人指点

戴小真

咋没有人回呀，难道真的是难题？

fdrandom

E选项有occasionally，偶尔不等于全局，不能削弱结论的。
B可以理解为有因无果的削弱，工资不变不能导致失业下降。这个因和结论的因不一致，其实，但是用排除法也只能选它了。