What argument does Feldstein use to support the walking trail plan?

Feldstein advocates for the walking trail plan by emphasizing the importance of providing people with opportunities to maintain their exercise routines, particularly when they have flexible schedules. This argument highlights the trail's potential to enhance community health and well-being by accommodating various lifestyles. By focusing on how the trail supports physical activity and promotes a healthier lifestyle, Feldstein effectively demonstrates the plan's value in encouraging regular exercise among residents. The other options, while attractive, do not directly address the primary focus on health benefits that adherence to an exercise routine offers, which is central to Feldstein's argument.