In many big cities, the temperature is often 3 to 5 degrees higher than in the nearby countryside. This is called the "Urban Heat Island" effect. What is the main cause of this?

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• A There are too many people breathing in a small space.
• B Concrete and asphalt (roads) absorb sun heat during the day and release it at night.
• C Skyscrapers are closer to the sun, so they get hotter.
• D City lights are left on all night, which warms the air.

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