GRE Logical Reading: ETS-GRE逻辑单题ETS - D4X14R690OZ4543QJ$

Which of the following, if true, most weakens the argument? A. Immigration reform will limit the pool of available workers. B. Government efforts have been shown to affect employment trends only rarely. C. The best available positions require skills not possessed by the vast majority of the unemployed. D. A small proportion of baby boomers will not retire as soon as is anticipated. E. Many out-of-work young people are unaware of these looming employment opportunities.