medium · GMAT Verbal
Cities that replaced four-way stop signs with roundabouts saw a 30% reduction in average vehicle idling time. To reach its goal of reducing municipal carbon emissions, the city council should replace all major stop-sign intersections with roundabouts.
Which of the following, if true, most strengthens the argument by providing a supporting mechanism?
- Vehicle idling at intersections is a primary contributor to total carbon emissions in urban environments.
- Roundabouts are generally safer for pedestrians than intersections with stop signs.
- Roundabouts completely eliminate all vehicle idling at the intersections where they are installed.
- Reducing carbon emissions is the single most important environmental priority for municipal governments.
- Most drivers prefer roundabouts over stop signs because they reduce travel time.
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