medium · GRE Verbal Reasoning
A workplace consultant surveyed employees at a large insurance firm and found that those who took brief walking breaks during the day completed, on average, 20 percent more claims per afternoon than those who did not. The consultant concluded that walking breaks improve afternoon productivity and recommended that the firm require all employees to take such breaks.
Which of the following, if true, most seriously undermines the consultant's recommendation?
- Some employees at the firm prefer to spend their breaks chatting with colleagues rather than walking.
- Employees who take walking breaks tend to be those assigned the simplest and fastest claims to process.
- Studies at other kinds of offices have found that walking breaks improve mood and reduce stress.
- The total number of claims that the firm receives varies substantially from one month to the next.
- At most other insurance firms, employees take fewer walking breaks than this firm's employees do.
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