A paragraph begins: 'Urban green spaces provide numerous psychological benefits to city residents.' The rest of the paragraph lists research studies on stress reduction, mood improvement, and cognitive restoration. What is the main idea?
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A
Urban green spaces improve the psychological well-being of city residents.
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B
Research studies are the best way to measure mood improvement.
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C
Cities need more parks to reduce overcrowding.
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D
Cognitive restoration is the most important benefit of nature.