An employer asks the survey question “How much money do you spend on gasoline per week to get to work?” of her employees that drive to work. Which best describes why she chose to only ask the employees that drive to work rather than all of her employees?

The question is about gasoline costs for commuting by car, so employees who drive to work are the relevant group to survey. They are the target of the survey; employees who do not drive would not have a relevant weekly gasoline cost for that commute. Therefore, choice A is correct.

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