Read the passage: "Urban farming has grown rapidly in cities worldwide, transforming rooftops and vacant lots into productive gardens. Advocates argue it reduces food insecurity, lowers carbon footprints, and builds community bonds." What is the main idea?
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A
Urban farming is expanding in cities and offers multiple community and environmental benefits
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B
Urban farming only helps wealthy neighborhoods
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C
Carbon footprints are the primary concern of urban farmers
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D
Rooftops are the only spaces used for urban farming