medium · GMAT Verbal
Researchers observed that commuters who use public transit report lower stress levels than those who drive. They concluded that public transit causes reduced stress.
Which of the following, if true, most strengthens this conclusion?
- Transit riders who later switched to driving reported no change in their stress levels.
- Public-transit usage has been increasing in major urban centers.
- Most drivers reported that they enjoy listening to music while stuck in traffic.
- The study compared individuals matched on income, commute time, and job type.
- Some public-transit systems are prone to delays and overcrowding.
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