In order to both reduce their overall insurance costs and provide extra compensation to their employees, many companies now offer to match funds that employees pay into flexible healthcare spending accounts. after a three year analysis of this practice in the tech industry, researchers concluded that the benefits to the companies went well beyond these expectations. In that industry, companies matching employee contributions to flexible healthcare spending accounts could, on average, expect their employee absentee rate to be 20% lower than among companies who did not.
Which of the following would weaken the conclusion of the three-year study?
(A) Those technology companies able to afford to match employee contributions to health accounts are usually so successful that they are able to be very selective those they hire.
(B) At companies that offer flexible healthcare spending accounts, employees may use them to pay for eye and dental care not covered by the normal health plan.
(C) Starting a flexible healthcare spending account requires substantial effort for the employees who desire one.
(D) In other industries where companies match employee contributions to flexible healthcare accounts, similar improvements in absentee rate have been seen.
(E) In the technology companies that match employee contributions to flexible healthcare accounts, average worker productivity is also higher.