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Question 1 of 5
The city of Portmund has a large taxi industry. Generally, the availability of taxis tends to increase at times when the demand for their service is higher. But according to a survey of driver hours and revenues, when demand for taxis is highest, the number of taxis in service tends to be far below its peak. One researcher has suggested that this is in part because many taxi drivers choose not to work when rain or snow makes for hazardous road conditions.
Which of the following, if true, would most contribute to strengthening the researcher's explanation?