Read the following paragraph:
'Urban gardening has seen a significant rise in popularity over the last decade. Many city dwellers are converting balconies, rooftops, and small yard spaces into productive gardens. This trend is driven by a desire for fresh, organic produce and a deeper connection to food sources. Furthermore, community gardens are flourishing, providing shared spaces for people to cultivate plants and build social ties. These green spaces contribute to biodiversity, reduce the urban heat island effect, and offer a sense of tranquility amidst the bustle of city life.'
What is the main idea of this paragraph?
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A
Community gardens are important for building social connections.
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B
Urban gardening is a growing movement with multiple benefits for city residents and the environment.
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C
People in cities want to grow their own organic produce.
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D
Rooftops and balconies are the best places for urban gardens.