You will hear a university professor giving a lecture on the topic of sustainable urban development. What is the main argument the professor makes?
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A
That green roofs are the most cost-effective solution for city pollution.
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B
That sustainable urban development requires a multi-faceted approach involving policy, technology, and community participation.
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C
That historical cities are unable to adapt to modern sustainability standards.
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D
That individual lifestyle changes are more important than governmental policies in creating sustainable cities.