新东方蓝皮书一题，求助各位NN

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

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

(A) Since1960 the teenagers unemployment rate has risen when the minimum wage has risen.

(B) Since1960 the teenagers unemployment rate has risen even when the minimum wage remained constant.

(C) Employers often hire extra help during holiday and warm weather seasons.

(D) The teenage unemployment rate rose more 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.

这是新东方蓝皮书上的33题，答案是B ，上课时狒狒讲过，无奈小女资质不够，现在再看实在想不通。望哪位NN鼎力相助。不胜感激。