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Companies that offer "employer sponsored insurance" (ESI) pay a portion of employees` health care costs. In the manufacturing sector last year, companies that offered ESI had worker absentee rates 22% lower, on average, than those at companies that did not offer ESI.

If, on the basis of the evidence above, it is argued that ESI decreases worker absenteeism, which of the following, if true, would most seriously weaken that argument?
  • AResults similar to those cited for the manufacturing sector have been found in other sectors of the economy where ESI is offered. 分析该选项
  • BAt companies that offer ESI, employees have access to preventative health care such as regular check-ups, routine laboratory tests, and nutrition counseling. 分析该选项
  • CBecause initiating an ESI plan requires a lot of paperwork for the company, employees, and the insurance provider, doing so is complex and time-consuming. 分析该选项
  • DMany firms in the manufacturing sector have improved workplace safety and decreased the occurrence of on-the-job injuries in the last five years, and most of these companies introduced ESI at the same time. 分析该选项
  • EIn manufacturing firms where ESI is offered, the average productivity is 2% higher than it is in those firms where workers are not covered by an ESI plan. 分析该选项
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正确答案: D

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